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Wyszukujesz frazę "Lead" wg kryterium: Temat


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:
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:
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:
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:
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:
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:
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:
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:
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:
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

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