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Tytuł:
Waterfowl hunting in the context of lead contamination and ethically non-conforming conduct
Autorzy:
Felsmann, M.Z.
Szarek, J.
Powiązania:
https://bibliotekanauki.pl/articles/14564.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
lead
lead intoxication
environment
waterfowl
hunting
lead contamination
public health
venison
Opis:
Projectiles made of lead alloys are used for waterfowl hunting in Europe. The paper demonstrated that lead pellets, due to their construction and use, contaminate the environment, especially water ecosystems. During one hunting session, tens of thousands of lead balls are introduced to the environment. Moreover, dispersed heavy metal is ingested by birds as gastroliths; as a result, game birds as well as protected birds become intoxicated with lead. During hunting trips, birds are also injured. When entering into the food chain, lead from pellets poses a risk to many living organisms, including predators and scavengers. Injured or intoxicated birds have difficulty joining seasonal migrations. Meat, especially of wild ducks and geese, is consumed during the hunting season by hunters and their families. Considering the level of lead in the muscles of game birds, venison consumers are also exposed to lead intoxication. In Europe, an increasing number of hunters who use lead pellets has resulted in lead being accumulated in game birds, which is a hazard to the public health. In view of the above facts and other hazards resulting from hunting, which endanger humans and animals, the authors recommend a total ban on waterfowl hunting.
Źródło:
Journal of Elementology; 2015, 20, 3
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acute lead poisoning in an indoor firing range
Autorzy:
Štěpánek, Ladislav
Nakládalová, Marie
Klementa, Viktor
Ferenčíková, Veronika
Powiązania:
https://bibliotekanauki.pl/articles/2085522.pdf
Data publikacji:
2020-05-15
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
lead poisoning
blood lead level
occupational exposure to lead
urine lead level
anemia
chelation therapy
Opis:
The presented case demonstrates that acute lead poisoning may occur due to just short-term exposure to a mixture of lead-containing dust and ammunition. Such exposure may result in high blood lead levels persisting for years in the absence of any symptoms. A middle-aged male with a history of an approximately 7-day cleanup of an old recreational firing range with large ammunition and dust deposits presented to an emergency department with abdominal pain, dyspnea, fatigue and impaired cognitive function. Given his occupational history, specific tests were performed that showed high lead concentrations in both blood and urine. The patient was diagnosed with acute lead poisoning. He was started on chelation therapy that improved both clinical and laboratory parameters. Over a subsequent nearly 3-year follow-up, the patient’s blood lead levels fluctuated and continued to be increased. Given the absence of other sources of lead exposure, these were likely due to the formation of bone deposits. Med Pr. 2020;71(3):375–9
Źródło:
Medycyna Pracy; 2020, 71, 3; 375-379
0465-5893
2353-1339
Pojawia się w:
Medycyna Pracy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective reduction of PbSO4 to PbS with carbon and flotation treatment of synthetic galena
Autorzy:
Zheng, Y.-X.
Liu, W.
Qin, W.-Q.
Han, J.-W.
Yang, K.
Luo, H.-L.
Powiązania:
https://bibliotekanauki.pl/articles/110717.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
wastes
lead sulfate
reduction
carbon
lead sulfide
flotation
Opis:
In order to recover lead from the zinc leaching residues, a new technology involving selective reduction of lead sulfate to lead sulfide with carbon followed by flotation was investigated. The reduction thermodynamics of PbSO4 was discussed and the effects of molar ratio of C to PbSO4, reaction temperature and time were examined by thermogravimetry (TG) and XRD. Verification tests were further carried out to prove the conclusions of thermodynamic and TG analyses, and the transformation extent could reach 86.45% under the optimal roasting conditions. The prepared galena was then subjected to micro-flotation tests, and the highest lead recovery could reach up to 75.32%.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 2; 535-546
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmentally Friendly Energetic Materials for Initiation Devices
Autorzy:
Ilyushin, M. A.
Tselinsky, I. V.
Shugalei, I. V.
Powiązania:
https://bibliotekanauki.pl/articles/358178.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
lead azide
LA
lead styphnate
LS
low toxicity primary explosives
Opis:
The problems of synthesis, properties and applications of environmentally-friendly, primary explosives are discussed. Several prospective, lead-free primary explosives have been prepared and thoroughly studied during recent decades. However, the manufacture of modern, 'green' energetic materials on an industrial scale for practical applications in civil and military primers, is a task for the near future.
Źródło:
Central European Journal of Energetic Materials; 2012, 9, 4; 293-327
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decrease in ambient air lead concentrations in Varna, Bulgaria, associeted with the introduction on unleaded gasoline
Autorzy:
Chuturkova, R
Iossifova, Y.
Clark, S.
Powiązania:
https://bibliotekanauki.pl/articles/49246.pdf
Data publikacji:
2010
Wydawca:
Instytut Medycyny Wsi
Tematy:
environment monitoring
Bulgaria
Varna city
gasoline
unleaded gasoline
air lead
lead
programme effectiveness
traffic
city
lead level
Źródło:
Annals of Agricultural and Environmental Medicine; 2010, 17, 2; 259-261
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neurologiczne skutki zawodowej ekspozycji na ołów
Neurological results of occupational exposure to lead
Autorzy:
Gać, P.
Waliszewska, M.
Zawadzki, M.
Poręba, R.
Andrzejak, R.
Powiązania:
https://bibliotekanauki.pl/articles/179069.pdf
Data publikacji:
2008
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
ołów
ekspozycja na ołów
choroby zawodowe
zatrucia ołowiem
lead
exposure to lead
occupational diseases
lead poisoning
Opis:
Narażenie na ołów stanowi w naszym kraju nadal istotny problem zdrowotny. W pracy zostały przedstawione aktualne poglądy dotyczące mechanizmów i skutków toksycznego wpływu ołowiu na układ nerwowy. Omówione zostały w szczególności wpływ ołowiu na centralny i obwodowy układ nerwowy, znaczenie ołowiu w powstawaniu nieprawidłowości w rozwoju układu nerwowego płodu, neuropsychologiczne skutki działania ołowiu na dzieci oraz mikromechanizmy zmian w układzie nerwowym w wyniku przewlekłej ekspozycji na ołów. Opisywane skutki ekspozycji na ołów powinny skłaniać do dalszej redukcji zawodowego i środowiskowego narażenia na ten metal, a istniejące rozbież- ności do kontynuowania badań w tej dziedzinie.
Exposure to lead is still considered an essential health problem in our country. The paper describes current view on mechanisms and effects of the toxic influence of lead on the nervous system. In the particular the influence of lead on the central nervous system and peripheral nervous system were discussed, implication of lead in generating the abnormalities in development of nervous system of fetus, the neuropsychological results of influence of lead on children and the micro-mechanisms of changes in the nervous system as a result of the long-lasting exposure to lead. The described effects of exposition to lead should encourage us to further reduction of occupational and environmental exposure to this metal, and existing divergences - to continue the research in this field.
Źródło:
Bezpieczeństwo Pracy : nauka i praktyka; 2008, 7/8; 14-17
0137-7043
Pojawia się w:
Bezpieczeństwo Pracy : nauka i praktyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania trwałych izotopów ołowiu - aspekty analityczne i znaczenie praktyczne
The study of stable lead isotopes - analytical issues and practical importance
Autorzy:
Krzciuk, K.
Powiązania:
https://bibliotekanauki.pl/articles/271376.pdf
Data publikacji:
2012
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:
ołów
izotopy
stosunki izotopowe ołowiu
lead
isotopes
lead isotopic rations
Opis:
Celem artykułu jest przedstawienie aktualnego stanu wiedzy na temat oznaczeń trwałych izotopów ołowiu oraz możliwości wykorzystania wyników badań w różnych dziedzinach nauki. Skład izotopowy ołowiu oznaczany w różnych próbkach (np. środowiskowych, medycznych, artefaktach archeologicznych) może służyć wyjaśnieniu problemów naukowych z zakresu ochrony środowiska, geologii, kryminalistyki, archeologii, ekologii, nauki o żywieniu i in. Popularność badań trwałych izotopów ołowiu wynika, między innymi, z coraz lepszego dostępu do nowoczesnych technik analitycznych pozwalających na precyzyjny pomiar stężeń izotopów (TIMS, MC-ICP-MS, LA-ICP-MS i in.). W niniejszym artykule skrótowo omówiono metodykę oznaczania trwałych izotopów ołowiu oraz podano przykłady badań stosunków izotopowych ołowiu w różnych dyscyplinach naukowych.
The aim of this paper is to present the current knowledge on determination of stable lead isotopes and to discuss the possibility of their application in different scientific disciplines. Lead isotope ratio determined in different kinds of samples (e.g. environmental samples, medical samples, artifacts) may be useful for elucidation of scientific problems in environmental sciences, geology, criminology, arheology, ecology, nutrition sciences etc. Growing popularity of lead isotope ratio studies results from facilitate access to modern analytical techniques that enable precise isotope measurements (TIMS, MC-ICP-MS, LA-ICP-MS etc.). This article briefly discusses the methods used in stable lead isotope determinations and gives examples of the studies carried out by researchers specializing in different scientific disciplines.
Źródło:
Aparatura Badawcza i Dydaktyczna; 2012, 17, 4; 29-35
2392-1765
Pojawia się w:
Aparatura Badawcza i Dydaktyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Lead-Zinc Slags of the Shymkent City on the Environment
Autorzy:
Salim, Yerbol
Issayeva, Akmaral
Kidirbayeva, K.
Zhumadulayeva, A.
Dossybayeva, G.
Bozhbanbaeva, N.
Ashirbayeva, S.
Powiązania:
https://bibliotekanauki.pl/articles/2173232.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
lead-zinc slag
lead ions
environment
phytoindication
accumulation
children's health
Opis:
Due to the rapid pace of urbanization, the lead-zinc slags previously located outside the settlement turned out to be within the city of Shymkent and began to pose a serious threat to the environment. Therefore, the purpose of the study was to investigate the impact of lead-zinc slags on the environment of Shymkent. It has been revealed that the fields of ruderal plant species are inversely correlated with the lead content in the soil, for phyto-indication of the state of soils, the most informative indicators are the phytocenotic composition and the projective covering of soils with vegetation. At the same time, the proportion of annual species in the control is 53.5 ± 5.6%; with an increase in the toxic load, their role gradually weakens, reaching from 14496.0 ± 105.1 mg/kg Pb2+ to 5.2 ± 0.4%. It was found that Dodartia orientalis, Centaurea squarrosa Willd., Plantago lancetofolium are hyperaccumulators of lead ions, while electron microscopic images showed that lead ions accumulate in the intercellular space of plants, forming significant conglomerates of 10–75 nm. The negative influence of lead-zinc waste has been established, which leads to the accumulation of lead in the blood of children and, as a consequence, is the cause of various diseases. The maximum lead content in the amount of 103 micrograms / dl was found in the blood of children in the area of the city, located 800–1000 m from the slag storage site. Developing hypochromic anemia in children indicates its toxic origin. It was revealed that 90% of children have such pathologies as biliary dyskinesia, dental caries, small anomalies of heart development.
Źródło:
Journal of Ecological Engineering; 2022, 23, 7; 83--89
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sulfur and lead isotope geochemical characteristics of Pb-Zn deposits in the Khau Loc zone, northeastern Vietnam, and their significance
Autorzy:
Hung, Khuong The
Tung, Ta Dinh
Binh, Do Quoc
Sang, Pham Nhu
Cuc, Nguyen Thi
Linh, Nguyen Thi Hoang
Tin, Quach Duc
Powiązania:
https://bibliotekanauki.pl/articles/2055848.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
lead-zinc
sulfur isotopes
lead isotopes
Khau Loc zone
northeastern Vietnam
Opis:
In northeastern Vietnam, the Khau Loc zone is considered to have high potential for lead-zinc mineralization. The lead isotope data for 18 galena samples and 18 ones of δ34S isotope data (including galena and pyrite samples) were collected from lead-zinc ore deposits in some areas in the Khau Loc zone, including Phia Dam, Khuoi Man, Ban Lin, Lung Dam, and Ta Pan. These were employed to investigate the sulfur and lead isotope geochemical characteristics of Pb-Zn deposits and their significance in this study. The samples were analyzed using the LA-ICP-MS to show that the Pb isotopic ratios of 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb in the galena samples range from 17.8908 to 18.6012, 15.5794 to 16.1025, 38.4420 to 39.2118, with the average values of 18.296, 15.749, and 38.812, respectively. The pyrite and galena samples had the δ34S isotope, ranging from 9.0 to 15.106. The sulfur isotope systematics implies that most of the lead-zinc ore formations originated from marine sedimentary evaporation deposits and magmatic intrusion-volcanic eruption sources rich in silica. The distribution of lead isotopic ratios had a well-defined cluster for each deposit, indicating the formation of lead-zinc deposits and lower crust and orogen trends. In addition, these findings of lead isotopic ratios and δ34S isotopes proved that the Khau Loc zone is an activated structure with continuous growth in continental crust thickness during the early Proterozoic and Cenozoic periods. Furthermore, the study results also presented the evolution of material sources involved in the formation of lead-zinc ores in the Khau Loc zone.
Źródło:
Geology, Geophysics and Environment; 2021, 47, 3; 143--157
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sweat lead and copper concentrations during exercise training
Autorzy:
Saran, Tomasz
Zawadka, Magdalena
Chmiel, Stanisław
Mazur, Anna
Powiązania:
https://bibliotekanauki.pl/articles/454846.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
copper
lead
physical effort
Opis:
Introduction. Skin is the largest organ of the human body. It plays an important role in protection against harmful substances found in the surrounding environment and takes part in the elimination of heavy metals from the body by sweating. The aim of the study was to evaluate the changes in the concentration of lead and copper in the sweat collected on the first and the fourteenth day of endurance training. Materials and methods. The research included 43 patients undergoing a supervised, two-week endurance training on a cycle ergometer and cross-trainer. The lead and copper contents were presented in relation to the sodium content as an indicator of the amount of excreted sweat. Results. The lead concentration in relation to the sodium content in the samples of sweat taken with the use of swabs is statistically significantly higher on day 1 (Me = 1.64-E-4) than the 14th day (Me = 0.37-E-4) p = 0.027. In the sweat samples collected with a plaster, the lead concentration on day 14 of rehabilitation (Me = 0.08-E-4) is statistically significantly lower than before the beginning of the training cycle (Me = 1.19-E-4) p = 0.044. The concentration of copper in sweat samples collected with swabs and patches on day 1 of the rehabilitation cycle does not significantly differ from the content of samples collected on day 14. Conclusions. Endurance training with submaximal heart rate results in reduced excretion of lead in the sweat and does not significantly affect the level of copper. Further research into the impact of physical effort on the excretion of metals from the body can help explain the results13
Źródło:
European Journal of Clinical and Experimental Medicine; 2018, 1; 14-19
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lead Exposure in Trader Communities in Industrial Area of the Battery Recycling Plant: Tangerang, Indonesia
Autorzy:
Oginawati, Katharina
Sidhi, Rifan
Susetyo, Septian Hadi
Powiązania:
https://bibliotekanauki.pl/articles/123452.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
lead exposure
urine lead
risk assessment
heavy metal
battery recycling plant
Opis:
The aim of this study was to look at the risk of community around the battery recycling plant in terms of the exposure to lead dust. The number of respondents amounted to 60 people from an industrial area and a residential area. The sample of the industrial area included 30 respondents with a composition of 15 men and 15 women. The same number of respondents was also examined in the residential area as a control area, located 5 km from the industrial area. Respirable dust was measured using a personal dust sampler, the concentration of lead in dust was measured using GF-AAS, while as a biomarker of exposure, the lead content in urine was measured using GF-AAS. The average values for respirable lead in industrial and residential areas are 0.92 μg/m3 and 0.92–1.34 μg/m3. The analysis of the lead content in urine for the industrial and residential areas produced an average value of 119 ppb and 123 ppb. The average value of HI for the lead exposure on the industrial and residential areas are in danger (HI > 1) which is 3.6 ± 1.94 and 2.18 ± 1.49. The OR values for the respondents in the industrial area compared to the residential areas amounting to 1.17 for the category of HI lead exposure and 1.22 for the category of lead in urine.
Źródło:
Journal of Ecological Engineering; 2020, 21, 4; 264-270
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Blood lead determinants and the prevalence of neuropsychiatric symptoms in firearm users in Mexico
Autorzy:
Aguilar Madrid, Guadalupe
Téllez-Cárdenas, Liliana
Juárez-Pérez, Cuauhtémoc A.
Haro-García, Luis C.
Mercado-García, Adriana
Gopar-Nieto, Rodrigo
Cabello-López, Alejandro
Powiązania:
https://bibliotekanauki.pl/articles/2177065.pdf
Data publikacji:
2015-11-12
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
neuropsychiatric symptoms
occupational exposure
lead exposure
blood lead
firearms
heavy metal toxicity
Opis:
Objectives To identify blood lead predictors and the prevalence of neuropsychiatric symptoms in firearm users of public security in Mexico. Material and Methods A cross-sectional study was performed on 65 males. We obtained socio-occupational data and determined venous blood lead (blood (B), lead (Pb) – BPb), as well as neuropsychiatric symptoms using the Q-16 questionnaire. A multiple linear regression model was constructed to assess determinants of BPb. Results The mean age in the study group was 34.8 years (standard deviation (SD) = 6.9, range: 21–60); the mean number of years spent in the company amounted to 14 years (SD = 8.5, range: 1–48). Twenty percent of the respondents (N = 13) used leaded glazed clay pottery (lead (Pb), glazed (G), and clay pottery (C) – PbGC) in the kitchen. During practice they fired a mean of 72 shots (SD = 60, range: 20–250), and during their whole duration of employment 5483 shots (SD = 8322.5, range: 200–50 000). The mean BPb was 7.6 μg/dl (SD = 6.8, range: 2.7–51.7). Two caretakers from the firing range had 29.6 μg/dl and 51.7 μg/dl BPb. The subjects who had shooting practice sessions ≥ 12 times a year reported a greater percentage of miscarriages in their partners (24% vs. 0%). Twelve percent of the respondents showed an increase in neuropsychiatric symptoms. The BPb multiple linear regression model explained R² = 44.15%, as follows: those who had ≥ 12 practice sessions per year – β = 0.5339 and those who used PbGC – β = 0.3651. Conclusions Using firearms and PbGC contributes to the increased BPb in the studied personnel. The determinants of BPb were: shooting practices >12 times a year and using PbGC. Blood lead concentrations reported in the study, despite being low, are a health risk, as evidenced by the prevalence of neuropsychiatric symptoms.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2016, 29, 2; 219-228
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of stochastic lead times on the bullwhip effect – an empirical insight
Autorzy:
Nielsen, P.
Michna, Z.
Powiązania:
https://bibliotekanauki.pl/articles/407121.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
supply chain
bullwhip effect
inventory policy
lead time demand
order-up-to-level policy
stochastic lead time
demand forecasting
lead time forecasting
lead time demand forecasting
Opis:
In this article, we review the research state of the bullwhip effect in supply chains with stochastic lead times. We analyze problems arising in a supply chain when lead times are not deterministic. Using real data from a supply chain, we confirm that lead times are stochastic and can be modeled by a sequence of independent identically distributed random variables. This underlines the need to further study supply chains with stochastic lead times and model the behavior of such chains.
Źródło:
Management and Production Engineering Review; 2018, 9, 1; 65-70
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DUCH ŚWIĘTY PROWADZI KU ZBAWIENIU
THE HOLY SPIRIT LEADS TOWARDS SALVATION
Autorzy:
MAJ, GRZEGORZ
Powiązania:
https://bibliotekanauki.pl/articles/512702.pdf
Data publikacji:
2014
Wydawca:
Wydawnictwo Diecezjalne Adalbertinum
Tematy:
HOLY SPIRIT
LEAD
SALVATION
Opis:
Vatican Council II is one of the most special moments of pneumatological experience in the twentieth century. This article is showing some of the pneumatological aspects especially those contained in the Dogmatic Constitution Dei Verbum, one of the most common documents of Vatican Council II. Revelation is God's great gift to man but at the same time also an invitation. A man in his freedom is invited to respond to the voice, but without the help of God’s intervention, he is not able to do that. Hence, by God's initiative, we find different ways by which God gives us the means to enter into this "dialogue of salvation". This article present the route to God’s dialogue and how the Holy Spirit in our time passes on the gift of redemption. Primarily has been made the analysis of Dei Verbum pneumatological aspects to understand better the Holy Spirit’s place in the transmission of the revelation of God in the Church. To emphasize this update the topic is worth quoting the words of Paul VI, whose beatification we expect . He emphasized that one of the most important messages of Vatican II was to recognize that the Church lives by the grace, presence and the action of the Holy Spirit, the Spirit of Christ, received by the growing Church on the day of Pentecost. The last Council focused around ecclesiological pneumatology. This article underlines pneumatological and fundamental truths concerning God's revelation and His message .This work will aim to see how the Fathers of the Vatican Council spoke of the Holy Spirit in his role in passing on the gift of salvation.
Źródło:
Studia Ełckie; 2014, 16, 4; 545-557
1896-6896
2353-1274
Pojawia się w:
Studia Ełckie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lead Leachability from Shooting Range Soils
Badania wymywalności ołowiu z gleby na terenie strzelnic
Autorzy:
Rauckyte, T.
Żak, S.
Pawlak, Z.
Oloyede, A.
Powiązania:
https://bibliotekanauki.pl/articles/388611.pdf
Data publikacji:
2009
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
gleba
zanieczyszczenie gleby ołowiem
teren strzelnicy
ołów ogółem
ekstrahowany ołów
TCLP
soil
lead soil contamination
shootingrange
total lead
extracted lead
Opis:
Lead contamination of soil in shooting ranges creates an environmental problem. Samples of soil were analyzed for total lead (T-[Pb]) and extracted lead (TCLP-[Pb]) using toxicity characteristic leaching procedure (TCLP). Total content of lead in soil samples varied from 640 to 4600 ppm. The TCLP test indicated that lead in most of soil samples exceeded the 5 ppm, a critical level of EPA regulation for solid and hazardous waste. The ratios of leaching lead (TCLP-[Pb]) to total lead (T-[Pb]) in soil samples ranged from 1.9 % to 5.2 %. The TCLP extracts from soil samples indicated lead concentration levels of 5 to 45 times over the US EPA regulatory level of 5 ppm and this was characterized as a toxic waste.
Problem środowiskowy stanowi zanieczyszczenie na terenie strzelnic gleby ołowiem. Analiz próbki gleby na zawartość ołowiu ogółem i ekstrahowanego, wykorzystując metodę ługowania TCLP. Ogólna zawartość ołowiu w próbkach glebowych wahała się od 640 do 4600 ppm. Test TCLP wskazał, że, w większości próbek glebowych przewyższył 5 ppm, co dla stałych/trwałych niebezpiecznych oznacza poziom krytyczny według regulacji EPA. W próbkach gleby stosunek ługowanego ołowiu do ołowiu ogółem waha się od 1,9 % do 5,2 %. Ekstrakty TCLP z próbek glebowych wykazały poziom stężenia ołowiu od 5 do 45 razy przewyższający poziom 5 ppm, określony przez amerykańską regulację EPA i gleby z terenu strzelnic oceniono jako toksyczne.
Źródło:
Ecological Chemistry and Engineering. A; 2009, 16, 4; 419-426
1898-6188
2084-4530
Pojawia się w:
Ecological Chemistry and Engineering. A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the tolerance of sunflower to lead-induced stress
Autorzy:
Winska-Krysiak, M.
Koropacka, K.
Gawronski, S.
Powiązania:
https://bibliotekanauki.pl/articles/15865.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
lead
phytoremediation
determination
plant tolerance
sunflower
Helianthus annuus
glutathione
metallothionein gene
lead stress
Opis:
Six-week old sunflower seedlings, cv. Ogrodowy, were treated with 0, 15, 45 and 60 mg Pb dm-3, and then the content of lead and selected physiological and biochemical parameters were measured. Photosynthesis efficiency, water relations (intensity of transpiration, relative water content (RWC)) and gene-encoding metallothionein were measured three times after 24, 48 and 72 hours of exposure to Pb. The content of glutathione and lead was analysed after 72 hours’ exposure to Pb. Most of the lead uptake was accumulated in the roots, then in the stems and leaves, but when re-calculated per plant dry weight, the uptake of the metal did not depend on the lead dose applied. The highest 60 mg Pb dm-3 treatment was accompanied by a significant decrease in dry weight content. Moreover, most of the lead taken up in these plants was transported to the stems and leaves (23.6% of total lead uptake). The lead doses used in this study did not affect the intensity of photosynthesis, but a decrease in transpiration and relative water content was observed. The glutathione level in the plants varied depending on the organ examined and the Pb concentration in the treatment. The expression of the metallothionein gene HaMT1 was observed in the stems only. These results indicate that the sunflower cultivar Ogrodowy is a promising plant for phytoremediation of lead-polluted soils.
Źródło:
Journal of Elementology; 2015, 20, 2
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oxidative stress assessment in lung of lead-exposed rats
Ocena stresu oksydacyjnego w płucach szczurów narażonych na ołów
Autorzy:
Machoń-Grecka, Anna
Kaletka, Zbigniew
Pryzwan, Tomasz
Szczęsny, Patrycja
Maciejczyk, Maciej
Kasperczyk, Aleksandra
Dobrakowski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/1035320.pdf
Data publikacji:
2018
Wydawca:
Instytut Medycyny Wsi
Tematy:
"lead poisoning"
"lung"
"oxidative stress"
Opis:
Objective. Little is known about lead toxic effects on lung tissue. Therefore, the present study was undertaken to estimate the values of selected parameters related to oxidative stress in the lung of rats exposed to lead acetate. Material and methods. Twenty male Wistar rats were randomly divided into two groups: control (n=10) and lead-treated (n=10). The lead-treated group was fed with regular rat chow and distilled water supplemented with lead acetate (1200 ppm) for 7 days. In lung homogenates, the level of malondialdehyde (MDA) and the activities of superoxide dismutase (SOD, CuZn-SOD, Mn-SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione reductase (GR), and glutathione-S-transferase (GST) were determined. Results. The activity of catalase was significantly higher in the lung of lead-treated rats than in controls by 98%. Similarly, the activities of GPx and GR were higher by 57% and 45%, respectively. The level of MDA was also higher in lead-exposed rats than in the control group by 52%. The remaining parameters did not differ between the studied groups. Conclusions. Lead exposure stimulates antioxidant defense mechanisms in rat lung; however, these mechanisms are insufficient to prevent lead-induced oxidative stress development
Wstęp. Toksyczny wpływ ołowiu na tkankę płucną jest słabo poznany. W związku z tym, prezentowany eksperyment miał na celu ocenę zmian w wybranych parametrach związanych ze stresem oksydacyjnym w tkance płucnej u szczurów narażonych na octan ołowiu. Materiał i metody. Dwadzieścia szczurów szczepu Wistar, podzielono na dwie grupy: kontrolną (n=10) i badaną z podawanym ołowiem (n=10). Szczury z grupy badanej były regularnie karmione granulatem dla szczurów i pojone wodą destylowaną z octanem ołowiu (1200 ppm) przez 7 dni. W homogenatach z tanki płucnej oznaczany był poziom malonylodialdehydu (MDA) i aktywność dysmutazy ponadtlenkowej (SOD, CuZn-SOD, Mn-SOD), katalazy (CAT), peroksydazy glutationowej (GPx), reduktazy glutationowej (GR), oraz transferazy glutationowej (GST). Wyniki. Aktywność katalazy była o 98% wyższa w grupie badanej aniżeli w grupie kontrolnej. Podobnie, aktywności GPx i GR były wyższe odpowiednio o 57% i 45%. Poziom MDA był również wyższy w grupie badanej, o 52% w porównaniu do grupy kontrolnej. Pozostałe parametry nie różniły się pomiędzy grupami. Wnioski. Ekspozycja na ołów stymuluje mechanizmy obrony antyoksydacyjnej, jednakże mechanizmy te są niewystarczające by zapobiec stresowi oksydacyjnemu wywołanemu działaniem ołowiu.
Źródło:
Medycyna Środowiskowa - Environmental Medicine; 2018, 21, 1; 21-24
1505-7054
2084-6312
Pojawia się w:
Medycyna Środowiskowa - Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cadmium and lead levels in selected goat and sheep tissues from areas under different antropogenic pressure
Autorzy:
Mundała, P.
Szwalec, A.
Baran, A.
Kędzior, R.
Powiązania:
https://bibliotekanauki.pl/articles/101410.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
cadmium
lead
sheep
goat
organ
Opis:
The aim of the study was to compare the levels of cadmium and lead in livers, kidneys and wool / hair / of sheep and goats reared in the vicinity of the steelworks in Nowa Huta in Kraków and in the control field, Rożniatów, in which there was no emitters of heavy metals. Samples were collected post mortem from one-year old animals of one breed (within a species) and one sex, who had lived from birth in the studied areas. Both species were fed with the same fodder and have remained in the same places. Wet mineralization was applied (mixture of nitric acid (V) and chloric (VII) (3: 1)) metal determination was done by a FASA method. The levels of the metals depend on the species, on the test areas and on the collected part of the animal. Tissues from sheep contained more cadmium and lead than the tissue of goats. The highest cadmium content was found in the kidney, lower in the liver, the lowest in the hair / wool of tested animals. Goat kidneys from both areas of research and sheep kidneys from Rożniatów meet consumer standards for cadmium. However, 20% of sheep kidneys sampled from Nowa Huta district exceeded the standards for cadmium. The lead content of both species exceeded the limit in all of the kidneys and livers from Nowa Huta district. In Rożniatów the standards were not fulfilled for all kidneys and livers of goats, and all kidneys and 70% of the livers of sheep.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2016, IV/2; 1337-1346
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of preoxidation on copper flotation from copper-lead mixed concentrate
Autorzy:
Peng, Zeng
Haiyun, Xie
Yanling, Jin
Pei, Zhang
Jialing, Chen
Liu, Dianwen
Powiązania:
https://bibliotekanauki.pl/articles/24085956.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
copper-lead mixed concentrate
peroxidation
separation of copper and lead
response surface methodology
Opis:
Flotation separation of galena and chalcopyrite is always a difficult problem in mineral processing. In this paper, the selective preoxidation of galena and chalcopyrite with sulfuric acid was developed, and then the two minerals were completely separated by flotation. The surface oxidation mechanism of galena and chalcopyrite with sulfuric acid was analyzed by Fourier transform infrared spectroscopy (FT-IR) and Atomic Force Microscopy (AFM), and the results showed that hydrophilic oxide film was formed on the galena surface, while the surface of chalcopyrite is still hydrophobic sulfide film, which led to the separation of the two minerals by flotation. In addition, the Response Surface Methodology (RSM) was used to analyze the influence of main preoxidation parameters on the flotation separation of copper-lead concentrate, and the parameters were further optimized, as follows: sulfuric acid concentration of 5.3 mol/L, oxidation temperature of 101.8 °C and time of 48.3 min. The mixed concentrate containing Cu 11.57% and Pb 16.75% was preoxidized under the above conditions, and the flotation separation verification results showed that Cu concentrate with Cu grade of 18.09% and recovery of 95.41%, and Pb concentrate with Pb grade of 44.96% and recovery of 95.94% was obtained respectively. This paper provides a new method of preoxidation combined flotation to achieve high-efficiency separation of copper-lead mixed concentrate.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 163253
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recent changes in sediment accumulation rates in Adventfjorden, Svalbard
Autorzy:
Zajaczkowski, M.
Szczucinski, W.
Bojanowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/48792.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
accumulation rate
caesium
subpolar fjord
210 lead
sediment
Adventfjorden
lead
137 caesium
Svalbard
Opis:
Recent sediment accumulation rates in Adventfjorden (Svalbard), a small subpolar fjord, were determined by 210Pb and 137Cs dating. Modern rates in the central basin decrease downfjord from 1.87 to 0.87 cm y−1 (2.6 to 1.19 g cm−2 y−1). Comparison of the modern values (1986–2001) with older ones (1963–86) reveals a marked increase in sediment accumulation rates in the last ten years. This correlates well with recent climate changes (warming and increase in precipitation). Comparison with particulate matter flux data indicates that a portion of the sediment is passed on to Isfjorden.
Źródło:
Oceanologia; 2004, 46, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The bullwhip effect in supply chains with stochastic lead times
Autorzy:
Michna, Zbigniew
Nielsen, Izabela Ewa
Nielsen, Peter
Powiązania:
https://bibliotekanauki.pl/articles/584974.pdf
Data publikacji:
2013
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
supply chain
bullwhip effect
inventory policy
stochastic lead time
lead time demand forecasting
Opis:
In this article we consider a simple two stage supply chain. We quantify the variance amplification of orders – the bullwhip effect in a model with stochastic lead times. Employing the moving average forecasting method for lead time demands we obtain an exact value of the bullwhip effect measure. We analyze the formula using numerical examples.
Źródło:
Mathematical Economics; 2013, 9 (16); 71-88
1733-9707
Pojawia się w:
Mathematical Economics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of infant exposure to lead and cadmium content in infant formulas
Ocena stopnia narazenia niemowlat na pobieranie olowiu i kadmu w preparatach mleka w proszku
Autorzy:
Winiarska-Mieczan, A
Powiązania:
https://bibliotekanauki.pl/articles/14982.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
child
infant formula
cadmium
lead
infant milk formula
infant exposure
cadmium content
lead content
Opis:
Infants and little children are the highest risk group as far as the exposition to toxic metals is concerned. Newly born babies do not have effectively functioning regulatory mechanisms and the absorption of mineral elements, including toxic ones, is higher than in older children and adults. Separate, more rigorous requirements have been determined for food products for infant nutrition. Special attention is required in the case of toxic metals, including lead and cadmium, which are regarded as particularly harmful to the organism. The objective of the present work was to establish the content of lead and cadmium in powdered milk used in the nutrition of infants in the first months of their lives. Moreover, on the basis of surveys, the popularity of using milk replacement formulas was determined, as well as factors affecting this situation. All the examined preparations were labelled as “a special nutrition product”. They had been purchased in different groceries in Lublin in October 2007, all before their use-by date. The shares of Pb and Cd were marked in the samples. It was demonstrated that only two preparations did not comply with the recommendations regarding the content of cadmium, while in the other samples the maximum value was not exceeded. It was also noted that the analysed preparations were not safe for babies as far as the content of lead was concerned. At the same time, it was observed that as many as 87% babies were breast-fed, which is a positive phenomenon, whereas 40% women used combined nutrition for their children (breast feeding alternately with powdered milk). The choice of a particular preparation resulted in the first place from the doctor’s recommendations, and next from babies’ preferences and friends’ opinions.
Niemowlęta oraz małe dzieci to grupa populacji o najwyższym ryzyku narażenia na toksyczne działanie metali. U noworodków zaraz po urodzeniu brak jest sprawnie działających mechanizmów regulacyjnych, a wchłanianie składników mineralnych, w tym także pierwiastków toksycznych, jest większe niż u dzieci starszych i osób dorosłych. Ustalono odrębne, bardziej rygorystyczne wymagania dla produktów spożywczych przeznaczonych do żywienia niemowląt. Szczególnej uwagi wymagają metale szkodliwe, do których zalicza się m.in. ołów i kadm, uznawane za szczególnie niebezpieczne dla organizmu. Celem pracy było ustalenie zawartości ołowiu i kadmu w mleku w proszku stosowanym w żywieniu niemowląt w pierwszych miesiącach życia. Ponadto na podstawie badań ankietowych określono popularność stosowania preparatów mlekozastępczych oraz czynniki wpływające na ten stan. Materiał do badań stanowiły preparaty uznanych marek, przeznaczone do żywienia niemowląt w pierwszych miesiącach życia. Wszystkie badane preparaty miały adnotację „produkt specjalnego przeznaczenia żywieniowego”. Produkty zakupiono w sklepach spożywczych na terenie Lublina w październiku 2007 r., w okresie ich przydatności do spożycia. W pobranych próbach oznaczono zawartość Pb i Cd. Jedynie dwa preparaty nie spełniały wymagań odnośnie do zawartości kadmu, w pozostałych wartość dopuszczalna nie została przekroczona. Ponadto stwierdzono, że analizowane preparaty nie są bezpieczne dla niemowląt pod względem zawartości ołowiu. Jednocześnie stwierdzono, że aż 87% dzieci było karmionych piersią, co jest zjawiskiem pozytywnym, przy czym 40% kobiet stosowało żywienie mieszane (karmienie piersią naprzemiennie z mlekiem w proszku). Największy wpływ na zakup danego preparatu miała porada lekarza, następnie upodobania dziecka oraz opinia znajomych.
Źródło:
Journal of Elementology; 2009, 14, 3; 573-581
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of lead and chloride ions on methane production in arable soils
Autorzy:
Wnuk, E.
Walkiewicz, A.
Bieganowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2082884.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
methane
methanogenesis
arable soil
lead
Opis:
Cultivated soils in high water conditions can be a source of methane (CH4). Despite the significant introduction of lead (Pb) into soils with fertilizers or sewage sludge, there are few reports concerning its impact on methane production in arable soils. The main premise of the study was to characterize the response of methanogenesis after soil contamination with Pb. For this reason, the effect of Pb on CH4 production in three different mineral arable soils was investigated. Lead, in the chloride form, was added at two concentrations, which were established based on the Sewage Sludge Directive (300 and 1 500 mg kg–1). Additionally, two types of controls were used – water and CaCl2 with chloride ions. It was observed that the process could be slowed down at the lower dose and that methane production was totally inhibited at the higher dose. Additionally, the inhibitory effect of the chloride ions on the process was also observed in the control samples. Despite the inhibition of methanogenesis in the soil, which has a positive effect on reducing the amount of the gas released, this process cannot be analysed individually. Other reactions in the soil should also be taken into consideration, and these changes which occur under the influence of the various factors should be investigated further.
Źródło:
International Agrophysics; 2020, 34, 2; 185-193
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of Lead from Groundwater of Veppanthattai block, Perambalur district, Tamil Nadu, India using Sugarcane Bagasse as Adsorbent
Autorzy:
Ibraheem, A. Mohamed
Nazeeb Khan, S. M. Mazhar
Powiązania:
https://bibliotekanauki.pl/articles/1112655.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Adsorbent
Groundwater
Lead
Sugarcane bagasse
Opis:
The present work measures the adsorption capacity of sugarcane bagasse to remove excess lead from groundwater. Batch adsorption experiments were carried out to evaluate the adsorption equilibrium, and the effects of four parameters (pH, adsorbent dosage, equilibrium time and particle size) on the adsorption of lead were investigated. Characterization of the adsorbent was carried out through SEM and FTIR instruments. Results confirm that the adsorption of lead takes place successfully on the surface of the adsorbent. The maximum efficiency of adsorption is up to 50% achieved in 5g adsorbent dosage, at an optimum pH 5, with a contact time of 120 minutes and 53 μm adsorbent size at 38.
Źródło:
World News of Natural Sciences; 2018, 18, 2; 213-222
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing of efficiency and dynamic effects of a drive system with a lead screw
Autorzy:
Lisowski, F.
Powiązania:
https://bibliotekanauki.pl/articles/246807.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
lead screws
efficiency
dynamic effects
Opis:
The paper presents experimental studies of a drive system with a lead screw. The concept and the construction of the test stand, its parameters as well as the applied measuring apparatus and the scope of tests are described. Furthermore, a measuring system and a methodology of determining the loads on the nut of the lead screw, based on the strain gauge measurements, were developed. A special nut bracket with specimens for the strain gauge measurement was designed. Since the specimens are simultaneously subjected to tension, two plane bending and non–free torsion, a coefficient essential for determining the torque on the nut of the lead screw was estimated based on the finite element analysis of the nut bracket under complex load condition. The first part of experimental studies includes the determination of the efficiency of the lead screw and the efficiency of the typical drive system with the lead screw. The impact of the load level and the constant resistance in the system are included in the research. The second part of the study concerns the determination of dynamic load coefficients for various operating parameters. The efficiency of the lead screw and the efficiency of a typical drive system with the lead screw as well as the dynamic factors at start–up and braking were determined based on experimental tests referred to a ball screw.
Źródło:
Journal of KONES; 2016, 23, 4; 297-304
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Morphological and Physiological Appearance of Two Vegetable Plants Due to Lead Exposure
Autorzy:
Lestari, Mahayu Woro
Rosyidah, Anis
Powiązania:
https://bibliotekanauki.pl/articles/2124397.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
kale
lead
morphology
physiology
spinach
Opis:
This research aimed to determine the effect of different concentrations of Lead (Pb) on the morphology of kale and spinach plants. The process involved planting kale and spinach seeds in tubs and transferring them to polybags with planting media in the form of soil and sand at a ratio of 4:1 after strong roots were developed. It is important to note that the media were analyzed to ensure the Pb content in the soil was below the threshold before planting. Pb was later provided 1 week before planting in the form of PbNO3 in the media at a dose of 1 and 2 g/polybag and mixed effectively to ensure even distribution, while the sample used as the control was not given any Pb. The transplanting process was conducted after the plants were 18 days old in the nursery and the initial observations at 9 DAT showed that the kale leaves were darker with a score of 3 than spinach with a score of 1, but the spinach leaves became darker in color with score 3 as the age of the plants increased. Moreover, the kale changed to a lighter color with a score of 2 from the 9th day of observation after transplanting, while spinach requires 15 DAT to become score 2 until the end of the observation. It should be pointed out that both plants showed morphological changes due to the existence of the Pb but their base leaves did not reflect any effect. The kale leaf tip became blunt, while the spinach leaf tip was not affected and both plants were discovered to have longer roots and more root hairs in the control compared to the treatments. Furthermore, the total chlorophyll of spinach in the control was higher than kale but observed to reduce as the concentration of Pb increased in the treatments. The morphology and physiology of spinach and kale plants changed due to the Pb exposure with the spinach was discovered to be more sensitive as indicated by more visible morphological damage to its leaves at the end of the observation. It is possible to use the morphology of spinach and kale to detect Pb-contaminated land.
Źródło:
Journal of Ecological Engineering; 2022, 23, 6; 213--222
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduction of Lead Oxide by Fine-Grained Carbonaceous Materials
Autorzy:
Matuła, T.
Siwiec, G.
Powiązania:
https://bibliotekanauki.pl/articles/356221.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lead oxide
lead
fine-grained carbonaceous materials
anthracite dust
coal flotation-concentrate
reduction
thermogravimetry
Opis:
As part of the presented work, tests were carried out to check the possibility of replacing of conventional reducers used in the lead pyrometallurgical processes by cheaper, but equally effective substitutes. For research of lead oxide reduction, the following fine-grained carbonaceous materials were used, ie anthracite dust and coal flotation concentrate, as well as traditional used coke breeze for comparison. The obtained test results indicate a similar ability to reduce the lead oxide of all studied carbonaceous materials.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 647-652
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical and experimental substantiation of obtaining an alloy from flotation tailings of lead-zinc sulfide ore
Autorzy:
Shevko, Victor M.
Makhanbetova, Baktygul A.
Aitkulov, Dosmurat K.
Powiązania:
https://bibliotekanauki.pl/articles/2200342.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
lead-zinc ore
cinder
enrichment tailings
thermodynamic modeling
electric melting
ferrosilicon
lead-zinc sublimates
Opis:
The article presents the results of thermodynamic and experimental research on the processing of cinders from the firing of Shalkiya deposit lead-zinc ore tailings with the production of siliceous ferroalloys. Thermodynamic modeling carried out using the HSC-6.0 complex based on the Gibbs energy minimization principle showed that the interaction occur with the formation of CaSiO3, FeSiO3, MgSiO3, K2OˑSiO2, FeSi, Fe5Si3, SiC, Fe3Si, Si, SiOg, FeSi2.33, FeSi2, CaSi, Zn, Zng, Pb, Pbg; an increase in the iron amount in the system allows increasing the silicon extraction degree into the alloy at 1800°C to 76%, to reduce the silicon concentration in the alloy from 41 to 24%; FS25 grade ferrosilicon formed at 1752-1867°C in the presence of 88-100% iron, and FS45 grade ferrosilicon – at 1863-1900°C and 20-22.4% iron. Electric melting of a charge containing 63.83% calcined cinder of tailings, 19.15% coke, and 17.02% steel chips allows to obtain FS45 grade ferrosilicon (44.1-43.9% Si) with the extraction of 69.7% silicon and sublimates with the content of 32-38% zinc and lead. The results obtained allow complex processing of lead-zinc sulfide ore tailings with the extraction of not only non-ferrous metals, but also silicon in the ferroalloy.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 1; art. no. 161853
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Activation of phenylpropanoid pathway in legume plants exposed to heavy metals. Part II. Profiling of isoflavonoids and their glycoconjugates induced in roots of lupine (lupinus luteus) seedlings treated with cadmium and lead
Autorzy:
Pawlak-Sprada, Sylwia
Stobiecki, Maciej
Deckert, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/1039920.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
cadmium
isoflavonoid
lead
lupine
phenylpropanoid pathway
Opis:
We examined changes in profiles of isoflavonoids in roots of lupine (Lupinus luteus L. cv. Juno) seedlings in response to treatment with two heavy metals: cadmium (at 10 mg/l) and lead (at 150 mg/l). Overall, 21 flavonoid conjugates were identified in root extracts, some of them with up to six positional isomers. The total amount of all isoflavonoids increased by about 15 % in cadmium-treated plants and by 46 % in lead-treated ones. Heavy metals markedly increased the content of two compounds: 2'-hydroxygenistein glucoside and 2'-hydroxygenistein 7-O-glucoside malonylated. Possible functions of the identified isoflavonoids in yellow lupine exposed to heavy metal stress are discussed.
Źródło:
Acta Biochimica Polonica; 2011, 58, 2; 217-223
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automation Marketing in research unit - real value or effectiveness fantasy
Marketing Automation w jednostce badawczej - realna wartość czy mrzonka skuteczności
Autorzy:
Jarosławska-Sobór, Sylwia
Dulewski, Mateusz
Wasilewski, Filip
Powiązania:
https://bibliotekanauki.pl/articles/1343161.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
marketing
automation
MA
lead generation
automatyzacja
Opis:
The aim of the article is to present the issue of Marketing Automation (MA, automation of marketing) and the possibilities of its use in the operational activity of research and scientific entities. MA is a modern, advanced technological solution aimed at improving marketing processes and wider use of data on the market and customers. In recent years it has been one of the most important trends in modern marketing, at the same time posing a real challenge for organizations operating in the field of science and research. The article discusses the experience of the Central Mining Institute, related to the implementation of solutions such as Marketing Automation, treated here as a case study.
Celem artykułu jest przedstawienie zagadnienia Marketing Automation (MA, automatyzacja marketingu) oraz możliwości jego wykorzystania w działalności operacyjnej jednostek badawczych i naukowych. MA to nowoczesne, zaawansowane rozwiązania technologiczne, których celem jest usprawnienie procesów marketingowych i szersze wykorzystanie danych o rynku i klientach. W ostatnich latach jest jednym z najważniejszych trendów współczesnego marketingu, stanowiąc jednocześnie prawdziwe wyzwanie dla organizacji działających w obszarze nauki i badań naukowych. W artykule omówione zostały doświadczenia Głównego Instytutu Górnictwa, związane z wdrażaniem rozwiązań typu Marketing Automation, potraktowane tu jako studium przypadku.
Źródło:
Marketing Instytucji Naukowych i Badawczych; 2019, 4(34); 21-42
2353-8414
Pojawia się w:
Marketing Instytucji Naukowych i Badawczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solid Phase Extraction for Evaluation of Occupational Exposure to Pb (II) Using XAD-4 Sorbent Prior to Atomic Absorption Spectroscopy
Autorzy:
Shahtaheri, S. J.
Khadem, M.
Golbabaei, F.
Rahimi-Froushan, A.
Ganjali, M. R.
Norouzi, P.
Powiązania:
https://bibliotekanauki.pl/articles/90822.pdf
Data publikacji:
2007
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
lead
sample preparation
atomic absorption spectroscopy
Opis:
Lead is an important constituent widely used in different industrial processes. For evaluation of workers’ exposure to trace toxic metal of Pb (II), solid-phase extraction (SPE) was optimized. SPE using mini columns filled with XAD-4 resin was developed with regard to sample pH, ligand concentration, loading flow rate, elution solvent, sample volume, elution volume, the amount of resins, and sample matrix interferences. Lead ions were retained on a solid sorbent and then eluted, followed by a simple determination of analytes with flame atomic absorption spectrometery. The obtained recoveries of metal ions were greater than 92%. This method was validated with 3 different pools of spiked urine samples; it showed a good reproducibility over 6 consecutive days as well as 6 within-day experiments. This optimized method can be considered successful in simplifying sample preparation for a trace residue analysis of lead in different matrices when evaluating occupational and environmental exposures is required.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2007, 13, 2; 137-145
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extraction and separation of zinc, lead, silver, and bismuth from bismuth slag
Autorzy:
Xing, Peng
Ma, Baozhong
Wang, Chengyan
Chen, Yongqiang
Powiązania:
https://bibliotekanauki.pl/articles/109744.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bismuth
zinc
lead
silver
extraction
separation
Opis:
The present paper deals with the extraction and separation of zinc, lead, silver, and bismuth from a refractory bismuth refining slag via a hydrometallurgical route. The process consists of a preliminary leaching of zinc with water, followed by the selective leaching of lead and silver with a calcium chloride solution, leading to the crystallization of lead chloride and the cementation of silver. The diagrams of the total concentrations of [Pb]/[Ag] versus [Cl-] and temperature in the Pb/Ag-Cl-H2O system were drawn, respectively, to determine the optimum concentration of leaching agent and leaching temperature. The potential-pH diagram of the Pb/Ag/Bi-H2O system indicates that the preferential leaching of lead and silver could be achieved. Finally, 98.8% of lead and 90.4% of silver were selectively removed by further leaching the water leaching residue with 400 g/dm3 of CaCl2 solution at pH 4.5 and 80 °C, while only 3.7% of bismuth was leached in this stage. Fifty-nine percent of lead in the leach liquor was separated out as PbCl2 by natural cooling. Ninety-five percent of silver in mother liquor was recovered by cementation with a lead sheet. The depleted CaCl2 solution can be sent to the leaching step again to close the loop.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 173-183
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrokinetic and flotation behavior of rutile in the presence of lead ions and aluminium ions
Autorzy:
Cheng, Hongwei
Liu, Changmiao
Guo, Zhenxu
Feng, Ansheng
Wei, Min
Lv, Zihu
Wu, Dongyin
Zhao, Dengkui
Powiązania:
https://bibliotekanauki.pl/articles/110558.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
lead ions
aluminium ions
rutile
flotation
Opis:
The effects of Pb(II) ions and Al(III) ions on the electro kinetic and flotation behavior of rutile were investigated by micro-flotation tests, zeta potential measurements and solution chemistry analysis. Micro-flotation results indicate that the Pb(II) ions can effectively improve the flotation recovery of rutile while the Al(III) ions significantly inhibit the flotation of rutile. Zeta potential measurements reveal that a collector styrene phosphoric acid (SPA) can adsorb on the rutile surface after the addition of Pb(II) ions, but hardly adsorb on the rutile surface after the addition of Al(III) ions. Pb(II) ions adsorb on the rutile surface in the form of Pb(OH)+ and Pb(OH)2(s), and the latter one is the main reason that activates rutile flotation. Al(III) ions adsorb on the rutile surface mainly in the form of Al(OH)3(s), which prevent the direct interaction between the rutile and the collector, resulting in a decrease of rutile flotation recovery.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 2; 458-466
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
W skali szarości – krótka historia srebrzystego ołowiu łączącego kolorowe szkła witrażowe
In Grayscale – a Brief History of Silvery Lead Used to Combine Color Stained Glass
Autorzy:
Pyka, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1367521.pdf
Data publikacji:
2021-06-21
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
lead
stained glass
arts
crafts
glass
Opis:
Katarzyna Pyka discusses lead as a substance which for centuries has made possible stained glass glazing both in sacral and secular buildings. This article focuses on the uses of lead and compares the work of stained glass artists in the past and today. Contrary the associations of this craft with vivid multicolored compositions, Pyka has decided to keep her discussion in grayscale; her purpose has been to emphasize the importance of this silvery metal, which has enriched the history of art from the Middle Ages by making possible the beauty of stained glass compositions.
Źródło:
Narracje o Zagładzie; 2021, specjalny; 291-309
2450-4424
Pojawia się w:
Narracje o Zagładzie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on battery repair and recycling workers occupationally exposed to lead in Karachi
Autorzy:
Haider, M.J.
Qureshi, N.
Powiązania:
https://bibliotekanauki.pl/articles/874438.pdf
Data publikacji:
2013
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
battery repair
recycling
worker
occupational exposure
lead
human exposure
blood lead level
hematological parameter
Karachi city
Opis:
Objective. The present study was carried out to investigate the effects of occupational lead exposure on the hematological and biochemical parameters in occupationally exposed and non exposed inhabitants of Karachi. Material and methods. In 100 lead exposed subjects recruited from automobile workshops, lead battery repair and recycling units located in Karachi and in 100 control subjects the general health status, hematological parameters and exposure markers for lead were measured. Results. Results indicated that the mean values of blood lead level and δ-aminolevulinic acid were significantly higher (P<0.05) while the activity of δ-aminolevulinic acid dehydratase were significantly decreased (P<0.05) among battery repair and recycling workers as compared to controls. The abnormalities in the blood lead level, δ-aminolevulinic acid and δ-aminolevulinic acid dehydratase were more frequent in lead exposed battery repair workers when compared with control subjects. The blood lead levels and δ-aminolevulinic acid were positively correlated while δ-aminolevulinic acid dehydratase was found to be negatively correlated with age, years of exposure and years of employment. Blood lead level was positively correlated with hemoglobin and RBC count while δ-aminolevulinic acid dehydratase was negatively correlated with hemoglobin concentration. The work related symptoms, droopiness, nasal symptoms and muscular pain were more frequent among battery repair workers as compared to control group. The findings of present study confirmed that occupational exposure to lead is associated with deviation in important hematological parameters and biological markers of exposure to lead among lead exposed workers, and also confirms the impact of lead exposure in the development of adverse effects among lead exposed workers. Conclusions. The study provides the data for risk assessment in lead battery repair workers of Karachi and suggests the need for preventive measures for battery repair workers and improvements to reduce occupational lead exposures to protect them from lead toxicity. It is suggested that hematological and physical examinations of lead exposed workers should be carried out periodically to prevent future health hazards.
Cel. Badania przeprowadzono w celu określenia wpływu zawodowego narażenia na ołów na hematologiczne i biochemiczne parametry u zawodowo narażonych w porównaniu do nienarażonych mieszkańców Karaczi. Materiał i metody. U 100 osób narażanych na ołów spośród pracowników zatrudnionych w zakładach naprawy i przetwarzania akumulatorów w Karaczi i u 100 osób kontrolnych badano ogólny stan zdrowia, parametry hematologiczne i markery narażenia na ołów. Wyniki. Wyniki wskazują, że średnie poziomy ołowiu i kwasu δ-aminolewulinowego we krwi były znacząco wyższe (P<0.05), podczas gdy aktywność dehydratazy kwasu δ-aminolewulinowego była znacząco niższa (P<0.05) u zatrudnionych przy naprawie i przetwarzaniu akumulatorów w porównaniu do osób z grupy kontrolnej. Poziomy ołowiu we krwi i kwasu δ-aminolewulinowego były skorelowane pozytywnie podczas gdy w przypadku aktywności dehydratazy kwasu δ-aminolewulinowego stwierdzono negatywną korelację do wieku i mierzonego w latach czasu narażenia. Stężenie ołowiu we krwi było pozytywnie skorelowane z hemoglobiną i liczbą erytrocytów a aktywność dehydratazy kwasu δ-aminolewulinowego była negatywnie skorelowana ze stężeniem hemoglobiny. Objawy związane z wykonywaną pracą, takie jak osłabienie, objawy ze strony nosa i bóle mięśniowe częściej występowały u osób narażonych niż z grupy kontrolnej. Wyniki przeprowadzonych badań potwierdziły, że zawodowe narażenie na ołów wiąże się ze zmianami istotnych parametrów hematologicznych i występowaniem markerów narażenia na ołów u narażonych pracowników, a także występowaniem szkodliwych skutków zdrowotnych. Wnioski. Wyniki badań dostarczają danych do oceny ryzyka u pracowników naprawy i recyklingu akumulatorów i sugerują potrzebę zastosowania środków zaradczych w celu obniżenia zawodowego narażenia na ołów u tej grupy pracowników i ochrony przed toksycznym oddziaływaniem ołowiu. Sugeruje się, że badania parametrów hematologicznych i medycznych u pracowników narażonych na ołów powinny być wykonywane okresowo w celu zapobieżenia przyszłym zagrożeniom zdrowia.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2013, 64, 1
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo modelling of Th-Pb fuel assembly with californium neutron source
Autorzy:
Oettingen, M.
Stanisz, S.
Powiązania:
https://bibliotekanauki.pl/articles/147828.pdf
Data publikacji:
2018
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
californium
lead
Monte Carlo
MCB
thorium
Opis:
This paper describes the methodology developed for the numerical reconstruction and modelling of the thorium-lead (Th-Pb) assembly available at the Department of Nuclear Energy, Faculty of Energy and Fuels, AGH University, Krakow, Poland. This numerical study is the first step towards integral irradiation experiments in the Th-Pb environment. The continuous-energy Monte Carlo burnup (MCB) code available on supercomputer Prometheus of ACK Cyfronet AGH was applied for numerical modelling. The assembly consists of a hexagonal array of ThO2 fuel rods and metallic Pb rods. The design allows for different arrangements of the rods for various types of irradiations and experimental measurements. The intensity of the fresh neutron source intended for integral experiments is about 108 n/s, which corresponds to the mass of about 43 μg 252Cf. The source was modelled in the form of Cf2O3-Pd cermet wire embedded in two stainless steel capsules.
Źródło:
Nukleonika; 2018, 63, 3; 87-91
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of Polyacrylamide-β-Zeolite Composite by Phytic Acid for the Removal of Lead from Aqueous Solutions
Autorzy:
Faghihian, H.
Farsani, S.N.
Powiązania:
https://bibliotekanauki.pl/articles/779338.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
adsorption
lead
composite
polyacrylamide
phytic acid
Opis:
Polyacrylamide-zeolite composite was prepared by direct polymerization of polyacrylamide in suspension of β-zeolite. Phytic acid was then immobilized on the composite surface. Fourier transform infrared spektrometry (FT-IR), X-Ray Diffraction (XRD) and Thermal gravimetry (TG) techniques were employed to characterize the synthesized adsorbent. The adsorptive features of the composite and the modifi Ed composite were investigated for the removal of Pb2+ from aqueous solution in view of dependency on pH, time, ion concentration, temperature, selectivity, kinetics and reusability. The adsorption isotherms were evaluated with reference to the Langmuir and Freundlich models. Thermodynamic of the system was calculated. ΔG<0 indicated that the adsorption process was spontaneous. Good compatibility of the adsorption kinetics to the pseudo-second-order model predicted that the rate-controlling step was a chemical sorption. The selectivity experiments showed that the adsorbents were selective toward Pb2+ In the presence of Zn2+ and Cd2+. The reusability of the adsorbent was tested for four regeneration cycles.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 1; 1-6
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of lead nitrate on cyanide leaching of gold and silver from turkish gold ores
Autorzy:
Sayiner, B.
Powiązania:
https://bibliotekanauki.pl/articles/109335.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
lead nitrate
gold
silver
cyanide leaching
Opis:
Effect of lead nitrate addition on cyanidation of Havran, Ovacık, Mastra LCu (low copper) and Mastra HCu (high copper) gold ores was investigated by laboratory tests at the Ovacik Gold Mine Metallurgy Laboratory. Leach tests were performed at optimum NaCN additions and pH values while different lead nitrate additions were applied. Ovacik cyanidation plant leaching time, 24 hours for the constant 100 Mg/h ore feed rate was applied as optimal for all lead nitrate tests. Results showed the increase in gold and silver recoveries between 0.4-1.2% for gold and 3.9-11.6% for silver at the end of 24 hours leaching by the addition of lead nitrate as 0.1-0.5 kg/Mg. NaCN consumption decreased or did not change except for the Ovacik ore. In the case of the Ovacik ore it slightly increased.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 2; 507-514
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytoremediation of Lead Contaminated Soil Using Croton (Cordiaeumvariegatum) Plants
Autorzy:
Herlina, Lina
Widianarko, Budi
Purnaweni, Hartuti
Sudarno, Sudarno
Sunoko, Henna Rya
Powiązania:
https://bibliotekanauki.pl/articles/124462.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
phytoremediation
lead
contaminated soil
Codiaeum variegatum
Opis:
The lead contamination of the environment affects the life of organisms, as the quality of the environment influences and determines the quality of living things, both plants and animals. Therefore, remediations need to be taken so that the polluted land could be repurposed for various activities safely. Phytoremediation is a method that employs plants to move, detach, or stabilize pollutants in the form of eitherorganic or inorganic compounds. In this study, the Croton (Codiaeum varigatum) plant was used as a phytoremediator planted in pots. Three pots were observed: 500 mg of Pb (NO3)2 was added to the first (T1) pot, 750 mg (T2) of Pb (NO3)2 was added up to the second (T2) pot, and no addition to the third (T0) pot. The parameters analyzed included plant biomass, the Pb content in plants, bioaccumulation factors, translocation factors, metal tolerance index, and photosynthetic pigment content. The results showed that Pb affected all of the analyzed parameters. Pb causes a decrease in the plant biomass and a downturn in chlorophyll a and b. The Pb accumulation in root > stem > leaf. The BAF value <1, the TF value <1 and the MTI value ranged 89.73–82.80%.
Źródło:
Journal of Ecological Engineering; 2020, 21, 5; 107-113
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-level environmental lead exposure and intellectual impairment in children — The current concepts of risk assessment
Autorzy:
Jakubowski, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2185480.pdf
Data publikacji:
2011-03-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
lead
children
risk assessment
environmental exposure
Opis:
Lead is an environmental contaminant. The majority of epidemiological research on the health effects of lead has been focused on children, because they are more vulnerable to lead than adults. In children, an elevated blood lead (B-Pb) is associated with reduced Intelligence Quotient (IQ) score. This paper summarizes the current opinions on the assessment of the health risk connected with the children’s environmental exposure to lead. The B-Pb level of concern of 100 μg/l proposed by the US Centers of Disease Control in 1991 was for a long time accepted as the guideline value. In the meantime there has been a significant worldwide decrease of B-Pb levels in children and present geometric mean values in the European countries range from 20 to 30 μg/l. The recent analyses of the association of intelligence test scores and B-Pb levels have revealed that the steepest declines in IQ occur at blood levels < 100 μg/l and that no threshold below which lead does not cause neurodevelopmental toxicity can be defended. European Food Safety Authority (EFSA) concluded in 2010, on the basis of results of Benchmark Dose (BMD) analysis, that an increase in B-Pb of 12 μg/l (BMDL₀₁) could decrease the IQ score by one point. It seems that this value can be used as a “unit risk” to calculate the possible decrease of IQ and, consequently, influence of the low-level exposure to lead (< 100 μg/l) on the health and socioeconomic status of the exposed population.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2011, 24, 1; 1-7
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recykling samochodowych akumulatorów kwasowo-ołowiowych - aspekt środowiskowy
Automotive recycling lead acid batteries - environmental aspect
Autorzy:
Kamińska, E.
Merkisz, J.
Powiązania:
https://bibliotekanauki.pl/articles/409779.pdf
Data publikacji:
2011
Wydawca:
STE GROUP
Tematy:
recykling
akumulatory kwasowo-ołowiowe
ekobilans
ołów
obciążenia środowiska
recycling
lead-acid batteries
ecobilans
lead
environmental pollution
Opis:
Autorzy przeanalizowali metody ekobilansowe, pod względem ich zastosowania dla określenia obciążeń środowiskowych recyklingu zużytych samochodowych akumulatorów kwasowo-ołowiowych. Opisali wybraną metodę (LCA) oraz scharakteryzowali technologię recyklingu wykorzystywaną przez jedną z polskich firm, w której planowane jest przeprowadzenie analizy ekobilansowej.
The authors analyzed methods, in terms of their use in determining the environmental burdens of recycling used automotive lead acid batteries. Described below the method (LCA), and characterized the recycling technology used by one of Polish companies, which is planned to analyze.
Źródło:
Management Systems in Production Engineering; 2011, 1 (1); 29-33
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lead transport and localisation in Lupinus angustifolius L. root cells
Autorzy:
Balcerzak, L.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/80056.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
lead transport
Lupinus angustifolius
root cell
lead nitrate
root meristem cell
transmission electron microscopy
cell organelle
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial pro-antioxidant reactions in the patients suffering from cataract in the interactions with cadmium and lead
Autorzy:
Kempka, Katarzyna
Kamiński, Piotr
Malukiewicz, Grażyna
Bogdzińska, Maria
Florczak, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/1164124.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
cadmium
cataract
environmental pollution
lead
pro-antioxidant
Opis:
Cataract is one of the main causes of vision loss. So far, it has been found that one of the causes of cataract formation is the accumulation of heavy metals in ocular tissues and environmental pollution. Research material consisted of blood from healthy volunteers (n = 81; Mogilno Lakeland) and those suffering from cataract (n = 90) from Ophthalmology Clinic, Bydgoszcz (2013, 2016). Samples were prepared in order to obtain plasma, which was used to analyze Fe, Cu, Zn, Mn, Pb, Cd, and Hg concentration (ICP-MS). The purpose of this study is to show the interaction of cataract with cadmium and lead during initial pro-antioxidative reactions and to study element-element interactions. To this end, we analyzed physiological mechanisms that aim to stop the destructive effects of toxic metals. We have shown that the action of zinc, copper and manganese is antioxidant. Concentration of these elements is higher (α = 0. 05, p < 0.05) in the cataract group than in the control. We found interactions Fe-Cu-Zn-Mn-Pb-Cd-Hg. Cd and Pb show a negative effect on the eye tissue and generate pathophysiological changes leading to lens opacity and influence the destabilization of pro-antioxidant reactions. Correlations of elements in the control (Cd-Zn: R = 0.240; Cd-Cu: R = 0.316) and in the sick group (Cd-Cu; R = 0.329) were significant. On the basis of our research we found that there are numerous relationships between the concentrations of chemical elements in the patients with cataracts and the controls. Significant role of antagonisms with cadmium and lead has been demonstrated; these elements contribute to the gradual development of cataract. A correlation between elements exhibiting pro-antioxidant activity in the interactions with cadmium and lead (p=0.000) can be a source of cataract changes. The differences in Cd and Pb concentration and their interactions with elements between the control and sick groups can be considered as a factor for the development of cataract.
Źródło:
World Scientific News; 2018, 108; 195-206
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of ammonium citrate tribasic as a leaching reagent for lead-bearing ore
Autorzy:
Liu, Junbo
Li, Shimei
Zhao, Biao
Deng, Jianying
Huang, Lingyun
Zhou, Yuanyuan
Chen, Cong
Liu, Quanjun
Powiązania:
https://bibliotekanauki.pl/articles/109649.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
lead
cerussite
ammonium citrate tribasic
leaching
kinetics
Opis:
In this study, the leaching process of a lead-bearing ore, consisting mainly of cerussite, in an ammonium citrate tribasic medium was investigated. The parameters including temperature, reagent concentration, particle size, and stirring speed were examined. During leaching process, the lead conversion rate increased with an increase in reagent concentration, reaction temperature, and stirring speed, and a decrease in particle size. The results show that about 95% of lead content was extracted from the samples with particle size range of +75-96 μm after 21 min leaching in 1.25 mol/L ammonium citrate tribasic solution at 800 r/min and 40°C. It was found that the leaching reaction followed the shrinking core model. The results indicated that ammonium citrate tribasic could be used as an effective leaching reagent for extracting lead from lead oxide ore.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 3; 689-700
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of characterization methods for adherent anode slimes in copper electrorefining
Autorzy:
Kiviluoma, M.
Aaltonen, M.
Aromaa, J.
Lundstrom, M.
Forsen, O.
Powiązania:
https://bibliotekanauki.pl/articles/110440.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
anode
slime
copper
electrorefining
nickel
lead
arsenic
Opis:
Adherent anode slimes can cause anode passivation in copper electrorefining and lower the efficiency of copper electrorefining. Declining concentrate grades cause larger impurity levels in anodes, thus creating larger quantities of slimes in the refining process. In order to investigate the characterization methods for adherent anode slimes in copper electrorefining, experiments were conducted for the Boliden Harjavalta Pori refinery material. Methods such as particle size determination, chemical (ICP) analysis, settling rate determination, XRD, SEM-SE, SEM-BSE and SEM-EDS were applied. In addition, adherent anode slime samples were compared to optical micrograph and SEM-BSE images of respective anode copper samples. It was shown that SEM-EDS and SEM-BSE provided precise information about phases formed during electrorefining. The settling rate and particle size had a correlation only with a copper content of anode slime. The main phases in the anode slime were copper and lead sulphates as well as copper-silver selenides. NiO was shown to be the major Ni-bearing phase in the adherent slime. Nickel, tellurium and lead had the strongest, whereas arsenic, selenium and antimony had the weakest tendency to report to the anode slime.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 295-302
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective solvent extraction of some heavy metal ions from aqueous solutions by octafunctionalized resorcin[4]arenes
Autorzy:
Kończyk, Joanna
Dlugosz, Jan
Powiązania:
https://bibliotekanauki.pl/articles/110830.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
solvent extraction
lead
chromium
calixresorcinarene
metal removal
Opis:
This paper presents the results of the study on the extraction capacity of 1,8,15,22-tetra(1- heptyl)resorcin[4]arene and its octasubstituted derivatives containing thiophosphoryl, ester and amide groups in the presence of Pb(II), Zn(II), Cd(II) and Cr(III) in solvent extraction process. Effects of the structure and concentration of the resorcinarene extractant and the composition of the aqueous phase as well as its acidity on the efficiency and selectivity of removal of the examined metal ions from model aqueous solutions were determined. The 1:1 stoichiometry for complexes formed between Pb(II) and Cr(III) and the octasubstituted resorcin[4]arenes was determined by classical slope analysis and loading test.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 2; 271-285
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential of Two Vegetable Plants in Reducing Lead Contamination in Soil
Autorzy:
Lestari, Mahayu Woro
Rosyidah, Anis
Powiązania:
https://bibliotekanauki.pl/articles/2173326.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Amaranthus spinosus
Crassocephalum crepidioides
lead
phytoremediation
vegetable
Opis:
Phytoremediation is the technique of using green plants to remove toxic pollutants from heavy metal contaminated soil through degradation and detoxification mechanisms. Therefore, this research examines the potential of two types of vegetable crops, namely Crassocephalum crepidioides and Amaranthus sp., in reducing Pb contamination in polluted soil. The treatments tested were planting media in polybags dosed with 0.3 and 6 g/polybag of Pb 1 week before planting. The method used was a randomized block design, with each treatment being repeated three times. Furthermore, each treatment consists of three sample plants. The growth evaluation started 6 days after planting and was performed every 6 days. The evaluation was conducted on plant height, leaf area, leaf chlorophyll content, fresh and dry weight of roots and shoots, Pb levels in roots and shoots, and Translocation Factor (TF). The results showed that the higher the Pb in the media, the lower the rate of change in plant height, leaf area, biomass, and chlorophyll content. Additionally, C. crepidioides and Amaranthussp. absorb Pb in the soil with a phytoextraction mechanism, thereby remediating heavy metal contaminated soil, as indicated by the TF value > 1. In conclusion,soil remediation should be performed using C. crepidioides, considering that it is less popular as a vegetable in Indonesia.
Źródło:
Journal of Ecological Engineering; 2022, 23, 8; 320--326
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption of Lead Ions from Aqueous Solutions onto Rice Husks, Continuous System
Autorzy:
Hawal, Laith Hamdan
Al-Sulttani, Ali Omran
Kariem, Nagam Obaid
Powiązania:
https://bibliotekanauki.pl/articles/2027895.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
adsorption
lead
rice husk
removal capacity
pH
Opis:
The continuous system of lead adsorption on rice husks was investigated in this paper. A fixed bed study was performed in many tests to investigate the influence of pH, the adsorbent height, the initial concentration of lead, the flow rate and processing time on the lead adsorption process. The results demonstrated that the lead removal capacity decreased when the pH value of the solution and the flow rate increased. The lead removal capacity increased due to the decreased initial concentration of lead. The results showed that the removal capacity increases along with the processing time and the adsorbent height in column. The largest removal was (81%) at pH of 4, the adsorbent height (50 cm), the initial concentration of lead (10 mg/l), the processing time (90 min.) and the flow rate (10 ml/min.). As a result, rice husks can be used to remove the lead instead of expensive commercial adsorbents, due to its availability, inexpensive and perfect adsorption property.
Źródło:
Journal of Ecological Engineering; 2021, 22, 10; 269-274
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractionation of Heavy Metals (Pb, Cr and Cd) In Municipal Sewage Sluges from Podlasie Province
Autorzy:
Łukowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/125087.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
lead
cadmium
chromium
metal fraction
sewage sludge
Opis:
In the samples of fresh dehydrated sewage sludges from municipal treatment plants in Grajewo, Bielsk Podlaski, Sokółka, Dąbrowa Białostocka, Knyszyn, Mońki, Augustów, Suwałki, Sejny and Suchowola the following determinations were made: pH, pseudo-total content of Pb, Cd and Cr, organic matter and dry mass. The contents of the above-mentioned elements in fractions were evaluated using modified BCR method (four fractions: 1-acid soluble and exchangeable, 2-reducible, 3-oxidizable, 4-residual). The lead content (mean values) in particular fractions can be arranged quantitatively in a sequence: F4 (51.4%) > F2 (30.3%) > F3 (19.2%) > F1 (7.2%), in the case of cadmium: F4 (49.0%) > F2 (23.6%) > F3 (18.9%) > F1 (15.5%) and in the case of chromium: F4 (65.0%) > F3 (30.6%) > F2 (6.8%) > F1 (3.1%). Cumulative content of lead in mobile fractions (F1+F2+F3) ranged from 20.7% to 89.9%; for cadmium from 32.9% to 76.9% and for chromium from 27.5 to 58.6% of pseudo-total content.
Źródło:
Journal of Ecological Engineering; 2017, 18, 1; 132-138
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation Of Intermetallic Compounds In Sn-Cu-Ni Lead-Free Solders
Badanie związków międzymetalicznych w bezołowiowych stopach lutowniczych Sn-Cu-Ni
Autorzy:
Nagy, E.
Kristaly, F.
Gyenes, A.
Gacsi, Z.
Powiązania:
https://bibliotekanauki.pl/articles/353266.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
intermetallic
lead-free solder
X-ray diffraction
Opis:
Interfacial intermetallic compounds (IMC) play an important role in Sn-Cu lead-free soldering. The size and morphology of the intermetallic compounds formed between the lead-free solder and the Cu substrate have a significant effect on the mechanical strength of the solder joint. In the soldering process of Sn-Cu alloys, Cu6Sn5 intermetallic compounds are formed. The complex structural behaviour of Cu6Sn5 IMC is temperature- and composition-dependent and it is long since subject to scientific research. The Cu6Sn5 phase basically exists in two crystal structures: hexagonal η-Cu6Sn5 (at temperatures above 186°C) and monoclinic η’-Cu6Sn5 (at lower temperatures). In the presence of Ni in the solder, the η-η’ transformation does not occur, therefore, the η-Cu6Sn5 phase remains stable. In this study the role of Ni in the (Cu,Ni)6Sn5 intermetallic compound in Sn-Cu lead-free solders was examined. Sn-Cu alloys with different Cu content (0.5 to 1 mass%) were modified through Ni addition. The morphology of the intermetallic compounds of the modified Sn-Cu alloys was investigated by optical microscopy (OM) and scanning electron microscopy (SEM), the IMC phases were examined with X-ray diffraction method (XRD).
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1511-1515
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł

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