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Tytuł:
Soil polychemical contamination on Beliy Island as key background and reference plot for Yamal region
Autorzy:
Abakumov, Evgeny
Shamilishviliy, Georgy
Yurtaev, Andrey
Powiązania:
https://bibliotekanauki.pl/articles/2042166.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
polycyclic aromatic compounds
reference landscapes
soil contamination
trace elements
Yamal
Źródło:
Polish Polar Research; 2017, 38, 3; 313-332
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trace elements in solutions from zeolite synthesis
Pierwiastki śladowe w roztworach po syntezie zeolitów
Autorzy:
Adamczyk, Z.
Makosz, E.
Nowińska, K.
Powiązania:
https://bibliotekanauki.pl/articles/396725.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
zeolite
trace elements
synthesis
solutions
zeolit
pierwiastki śladowe
synteza
popioły lotne
Opis:
The paper presents the content of selected elements in solutions formed after the synthesis of zeolitic material based on fly ash. Fly ash samples were taken from two pulverized fuel-fired boilers at the Rybnik Power Plant: one boiler fired solely with coal and one co-fired with coal and biomass. The tests conducted have shown that solutions remaining after zeolite synthesis from fly ash generated in boilers co-fired with coal and biomass had higher content of elements than those derived from fly ash generated from burning only coal. It was also found that increasing NaOH concentration of the solution used in zeolite synthesis caused increased content of the individual elements.
W artykule przedstawiono zawartości wybranych pierwiastków w powstałych roztworach po syntezie materiału zeolitowego na bazie popiołu lotnego. Próbki popiołu lotnego pochodziły z Elektrowni Rybnik z dwóch kotłów pyłowych: opalanego czystym węglem i ze współspalania węgla z biomasą. Przeprowadzone badania wykazały, że wyższe zawartości pierwiastków występują w roztworach poreakcyjnych, powstałych po syntezie popiołów pochodzących ze współspalania węgla z biomasą, niż w roztworach po syntezie popiołów będących produktem spalania czystego węgla. Stwierdzono ponadto, że wraz ze wzrostem stężenia NaOH roztworu zastosowanego do syntezy zeolitów wzrasta ilość poszczególnych pierwiastków.
Źródło:
Civil and Environmental Engineering Reports; 2013, 11; 5-11
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Trace Elements (Co, Cr) on the Microstructure and Physical Properties of Al-Si-Cu-Mg-Fe Extruded Alloy
Autorzy:
Ahn, S. S.
Sharief, P.
Lee, C. H.
Son, H. T.
Kim, Y. H.
Kim, Y. C.
Hong, S.
Hong, S. J.
Powiązania:
https://bibliotekanauki.pl/articles/352787.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si alloy
microstructure
extrusion
coefficient of thermal expansion
trace elements
Opis:
Trace elements Co, Cr were added to investigate their influence on the microstructure and physical properties of Al-Si extruded alloy. The Co, Cr elements were randomly distributed in the matrix, forms intermetallic phase and their existence wereconfirmed by XRD, EDS and SEM analysis. With addition of trace elements, the microstructure was modified, Si particle size was reduced and the growth rate of β-(Al5 FeSi) phase limited. Compared to parent alloy, hardness and tensile strength were enhanced while the linear coefficient of thermal expansion (CTE) was significantly reduced by 42.4% and 16.05% with Co and Cr addition respectively. It is considered that the low CTE occurs with addition of Co was due to the formation of intermetallic compound having low coefficient of thermal expansion. The results suggested that Co acts as an effective element in improving the mechanical properties of Al-Si alloy.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 857-862
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Trace Metal Concentrations in Three Seafood Deep-Sea Fished Caught in the Moroccan Atlantic
Autorzy:
Akhouchal, Ihya
Ait Alla, Aicha
Hajji, Sara
Agnaou, Mustapha
Moukrim, Abdellatif
Powiązania:
https://bibliotekanauki.pl/articles/1955583.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
cephalopod
shrimp
fish
metallic trace element
deep sea fishing
food safety
validation of control measure
Opis:
The investigation within the framework of this study was carried out on three marine species fished off in Moroccan coasts, namely: a fish, the sole (Solea Vulgaris), a cephalopod, the cuttlefish (Sepia Officinalis) and a crustacean, the pink shrimp (Parapenaeus Longirostris). The aims of this study were assessing the level of concentration in these three marine species, of three metallic trace elements: lead (Pb), cadmium (Cd) and mercury (Hg) and giving a reflection on the way in which Moroccan deep-sea fishing professionals can join a food safety management system to ensure the safety of their product and promote their competitiveness. Sampling was carried out at the port of Agadir city after landing of the deep-sea fishing boats which operate beyond 10 nautical miles, offshoring the seabed of Agadir for pink shrimp (Parapenaeus Longirostris), and in Dakhla city offshore for sole (Solea Vulgaris) and cuttlefish (Sepia Officinalis). Trace metal analysis was performed on individual muscles belonging to the three species. The results of the conducted investigations show that the Pb content varies between 0.01 ppm and 0.27 ppm in Solea Vulgaris; between 0.015 ppm and 0.16 ppm in Sepia Officinalis and between 0.022 ppm and 0.38 ppm for Parapenaeus Longirostris. For Cd, the concentrations vary between 0.0047 ppm and 0.050 ppm in Solea Vulgaris; between 0.0025 ppm and 0.254 ppm in Sepia Officinalis and between 0.0065 ppm and 0.11 ppm in Parapenaeus Longirostris. Concerning Hg, the contents vary between 0.0006 ppm and 0.075 ppm in Solea Vulgaris; between 0.0008 ppm and 0.05 ppm in Sepia Officinalis and between 0.0016 ppm and 0.09 ppm in Parapenaeus Longirostris. It appears from this study that the metal contents detected at the level of the three species of seafood investigated are below the regulatory thresholds. These results can be considered as the first basis for validating the control measure linked to the absence of metallic contamination of the three species in the sites studied.
Źródło:
Journal of Ecological Engineering; 2021, 22, 9; 87-98
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Soil Pollution Levels in Al-Qadisiyah Governorate, Iraq Using Contamination Index and GIS
Autorzy:
Al-Khuzaie, Marwah M.
Abdul Maulud, Khairul Nizam
Powiązania:
https://bibliotekanauki.pl/articles/2068473.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
geo-accumulation index
pollution load index
trace element variation
inverse distance weighting
bayesian kriging
Opis:
The precise determination of trace element concentrations in the soil of the Al-Qadisiyah Governorate is part of the Iraqi sedimentary plain is required to eliminate high levels of harmful elements in polluted soils. The soil samples were collected from 28 representative profiles in Al-Shamiyah city. The soil profiles were defined using virtual characterization. In this study, I-geo was used to analyze soil pollution. The goals and destinations of the I-geo readings Contamination of Cd, Ni, Pb, and Zn in various soil strata. I-geo (Cd) generally range from 0.58 to 4.71, I-geo (Ni) range from 0.09 to 4.07, I-geo (Pb) ranged range from 0.07 to 2.79, and I-geo (Zn) ranges from zero to 2.79, depicting the local differences in I-geo for pollutants in the research area. Suggesting that the research area had been heavily polluted from Cd in the varied layers of the soils. On the maps pertaining to Zn and Pb, the majority of the research area was primarily covered in the orange and blue hues, suggesting that a significant portion of the research area was likely to be severely polluted from Cd and Ni. Moreover, the land cover layouts of Ni in layers of the soils revealed concentrations rising towards to the western sections, which could be attributed to proximity to a major drain. The results display that its I-geo value of four trace metals generally range from non-pollute to significantly heavily polluted. The I-geo data show significant differences in levels of the Ni, Cd, Zn, and Pb in different soils strata. Including these findings, the soil in Al-Shamiya, Al-Qadisiyah Governorate contains high levels of Cd, Ni, Pb, and Zn. Industries of fossil fuel combustion, as well as other man-made wastes include agricultural nutrients, soil conditioners, and sludge, particularly, ammonium phosphate pollution in soils. The pollutant load index (PLI) reveals a baseline level of contamination in 28 locations, as well as a decline in soil quality in four others. Finally, assessing the danger of contamination for trace metals utilizing the I-geo and PLI by using the GIS method and multimodal models is a helpful and relevant strategy.
Źródło:
Journal of Ecological Engineering; 2022, 23, 3; 206--213
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemical signatures of pervasive meteoric diagenesis of Early Miocene syn-rift carbonate platform, Red Sea, NW Saudi Arabia
Autorzy:
Al-Ramadan, K.
Powiązania:
https://bibliotekanauki.pl/articles/2060345.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
meteoric diagenesis
carbonate
stable isotopes
trace elements
Red Sea
Miocene
Opis:
Different diagenetic environments have been recognized in the Early Miocene carbonate platform of Musayr Formation in the Red Sea rift area. Early marine diagenesis includes micritisation that occurs as thin envelope around skeletal and non-skeletal grains in low-energy mud dominated facies and isopachous fibrous calcite in high-energy grain-dominated facies. Pervasive meteoric water diagenesis resulted in cementation of the carbonates by coarse-crystalline blocky-drusy calcite and meniscus cements. Depletion of oxygen (avg. –9.08‰), carbon (avg. –1.6‰) isotopes and trace elements concentrations (avg. values of Fe: 1387 ppm; Mn: 1444 ppm; Sr: 419 ppm; Na: 1194 ppm) in conjunction with negative correlation between Mn2+ and oxygen isotope data suggest variable degrees of fluid-rock interactions and pervasive meteoric diagenesis. The formation of meteoric diagenesis in the Musayr Formation can be explained by two subsequent mechanisms: (1) the presence of meteoric lenses during the time of deposition might have been associated with active freshwater input from the hinterland (NE) due to fall in the relative sea level; (2) later uplift episode during Plio-Pleistocene may have also contributed to the pervasive meteoric diagenetic alterations of the carbonates of the Musayr Formation. The first mechanism is supported by the cement stratigraphy where the blocky-drusy cements postdate the meniscus cement. The latter mechanism seems to have more pronounced effect on the alteration of Musayr carbonate sequence by observing the occurence of late cements such as blocky calcite in most of the samples. The impact of meteoric diagenesis on the studied samples suggest that dissolution is less severe than cementation, hence the visible porosity is very low. Understanding the timing of meteoric diagenesis provides useful information about the reservoir quality distribution in syn-rift carbonate sequences.
Źródło:
Geological Quarterly; 2017, 61, 1; 239--250
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring the extent the environmental pollution of the waters of the Diwani River some trace elements resulting from Diwani textile factory using some spectroscopic methods
Autorzy:
Al-Rufai, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/372338.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
Iraq
Diwani River
trace elements
Diwani textile factory
spectroscopic methods
Irak
Rzeka Diwani
pierwiastki śladowe
fabryka tekstyliów
metody spektroskopowe
Opis:
The concentrations of some trace elements cobalt, nickel, lead, mercury cadmium, copper and Iron as well as pH value and the conductivity were determined in the samples of water which input and output (waste) from AL-Diwani textile factory and the effect of it on the AL-Diwani river water which is nearest from the factory through one month. The concentrations of above elements were determined in the samples by two methods. The flame Atomic absorption spectrophotometry and the spectrometry method which is satiable for each ion and making Analytical comparative between them from some analytical values like correlation coefficient(r), relative standard error Erel%, recovery value Re% and relative standard deviation RSD% for each ion. It is found that the first method is more accuracy for measuring the all elements concentrations except measuring of Iron. From results we show that the Lead element is more concentration among other elements which was the middle concentration was 3.3 ppm. The cobalt element is less concentration from other elements which was the middle of it concentration was 0.043 ppm in the waste water samples and other elements have concentration between them in the different samples. We show the increasing on the acidity and Conductivity for waste samples as comparative with the other samples which were pH between 6.5-7.2 and the Conductivity from the instrument directly in between 1210-1913 mS∙cm-1 and the measuring was making at the room temperature.
Źródło:
Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski; 2016, 164 (44); 37-54
1895-7323
Pojawia się w:
Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of Trace Elements in Surface Water and Sediments from Warri River in Warri, Delta State of Nigeria
Autorzy:
Ama, Ibiam Ntachiobi
Nwajei, Godfry E.
Agbaire, P. O.
Powiązania:
https://bibliotekanauki.pl/articles/1114111.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Contamination
Trace elements
Warri River
pollution index
Opis:
The pollution of surface water and sediments by heavy metals has become a difficult thing to deal with due to their toxicity and accumulative behavior. The present study was undertaken to provide information on the concentrations and distribution of selected heavy metals in surface water and sediments from Warri River, and to compute a contamination/pollution index of heavy metals. Surface water and sediment samples were collected using standard methods and then analysed for nine trace metals. These metals were determined using a Flame Atomic Absorption Spectrophotometer – UNICAM 929. According to our results, the mean concentrations of the select metals in the sediments were higher than those of the surface water. The figures, however, varied significantly in the six sample locations (SW1–SW6). In the sediments, the highest mean concentration was of Fe (504.13 mg/kg) in location SW1, whereas in surface water, generally, the highest mean concentration was of Fe (1.23 mg/l). In other words, mean metal levels in the sediments exceeded those of surface water. This indicates that sediments are a sink for metal pollution loads. Computation of contamination/ pollution index in sediment matrix revealed that Cd moderately polluted the sediment, Zn, Fe, Ni slightly, yet significantly contaminated the sediment, while Cu, Cr and Mn very slightly contaminated the sediments. The mean values of metals in this present study were compared with other values reported by other researchers. The higher than normal metal values were attributed to anthropogenic wastes, runoff, refinery jetty and varied petroleum related activities in the area.
Źródło:
World News of Natural Sciences; 2017, 11; 65-82
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rare-earth and trace elements of the lower Cambrian–Lower Cretaceous siliciclastic succession of NE Gondwana in Jordan : from provenance to metasomatism
Autorzy:
Amireh, Belal S.
Saffarini, Ghazi A.
Amaireh, Mazen N.
Jarrar, Chaleb H.
Abed, Abdulkader A.
Powiązania:
https://bibliotekanauki.pl/articles/2134835.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Jordan
NE Gondwana
rare-earth and trace elements
fractionation
provenance proxies
Arabian-Nubian Shield
siliciclastics
Opis:
The present bulk-rock geochemical study aims to answer some questions concerning the distribution and variability of trace elements (TEs) and rare earth elements (REEs) in the lower Cambrian–Lower Cretaceous sandstones and mudstones of NE Gondwana in Jordan. The study proved that the REE and the TE distribution patterns in both detrital and authigenic, light and heavy minerals are controlled principally by the source-rock provenance, followed by an interplay of many factors: chemical weathering, recycling, hydraulic sorting, locally low-temperature, hydrothermal metasomatism, depositional environment and redox conditions, and diagenesis. On the basis of specific trace elements, trace-element ratios, and petrographic proxies, the provenance is constrained to be mainly felsic-, rarely mafic granitoids of the Arabian-Nubian Shield, and less commonly, recycled Palaeozoic and Mesozoic siliciclastic strata. REEs are hosted mainly in zircon, Ti-bearing minerals, and partly in clay minerals. They were depleted by both chemical weathering and recycling; nevertheless, they were enriched by subsequent hydraulic sorting and low-temperature, hydrothermal metasomatism. Chemical weathering initially depleted zirconium. However, this was counteracted by subsequent enrichment through recycling, hydraulic sorting, and low-temperature, hydrothermal metasomatism. The fractionation of the other TEs, due to these sedimentological factors during the genesis of subarkosic arenites, quartz arenites and mudstones, is discussed and some conclusions are derived. The Eu negative anomaly was enhanced significantly by recycling and low-temperature, hydrothermal metasomatism. Scandium abundance increased with decreasing grain size from coarse sand to the mud fraction. The recorded REE and TE fractionation might also apply to siliciclastics in similar, geological environments.
Źródło:
Annales Societatis Geologorum Poloniae; 2022, 92, 2; 109--158
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nutrient requirements of the premature infant and recommended nutrient intakes
Autorzy:
Anderson, G.H.
Zlotkin, S.H.
Powiązania:
https://bibliotekanauki.pl/articles/1372549.pdf
Data publikacji:
1996
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
nutrient intake
trace element
magnesium
premature infant
vitamin
water
carbohydrate
energy
nutrient requirement
feeding
fat
calcium
sodium
nutrient composition
potassium
protein
mineral intake
phosphorus
chloride
Opis:
In summary, the nutrient requirements of the premature infant are not well defined, but the CPS Nutrition Committee has provided a systemic framework for describing recommended nutrient intakes. These current recommended intakes appear to provide safe quantities of nutrients that support intrauterine growth rates. Still uncertain, however, is the extent to which the recommended intakes lead to the provision of energy and nutrients in quantity and composition in amounts that allow the premature infant to achieve all aspects of normal in utero development, especially that of the nervous system.
Źródło:
Polish Journal of Food and Nutrition Sciences; 1996, 05, 3; 3-12
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przyjemność przed-tekstu. Proces tekstotwórczy jako temat dla polskiego „literaturoznawstwa (w) przyszłości”
The Pleasure of the Pre-Text. The Text-Making Process as a Question for Polish “Literary Studies of/in the Future”
Autorzy:
Antoniuk, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/466891.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
krytyka genetyczna
proces twórczy
brulion utworu literackiego
zwrot kulturowy
filologia
ślad
genetic criticism
creative process
literary draft
cultural turn
philology
trace
Opis:
Mateusz AntoniukJagiellonian University, CracowFaculty of PolishDepartment of 20th Century Polish LiteratureThis article concerns the theory and practice of a variety of approaches to the literary creative process. The main thesis is that scholarship of this kind – quite popular outside of Poland – may be seen as interesting proposition and simultaneously as a challenge for contemporary (and future) Polish literary criticism. The author argues that Polish genetic criticism stays in touch with both the “cultural turn” and the idea of  the “return to the philology.” In conclusion, the category of the “trace” and its applicability for the purposes of genetic criticism is discussed. key words: genetic criticism, creative process, literary draft, cultural turn, philology, trace słowa klucze: krytyka genetyczna, proces twórczy, brulion utworu literackiego, zwrot kulturowy, filologia, ślad
Mateusz AntoniukJagiellonian University, CracowFaculty of PolishDepartment of 20th Century Polish Literature This article concerns the theory and practice of a variety of approaches to the literary creative process. The main thesis is that scholarship of this kind – quite popular outside of Poland – may be seen as interesting proposition and simultaneously as a challenge for contemporary (and future) Polish literary criticism. The author argues that Polish genetic criticism stays in touch with both the “cultural turn” and the idea of  the “return to the philology.” In conclusion, the category of the “trace” and its applicability for the purposes of genetic criticism is discussed. key words: genetic criticism, creative process, literary draft, cultural turn, philology, trace słowa klucze: krytyka genetyczna, proces twórczy, brulion utworu literackiego, zwrot kulturowy, filologia, ślad
Źródło:
ER(R)GO: Teoria – Literatura – Kultura; 2017, 34
1508-6305
2544-3186
Pojawia się w:
ER(R)GO: Teoria – Literatura – Kultura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nowoczesne metody wizualizacji śladów wykorzystywanych w badaniach łusek i pocisków
Modern trace visualisation methods for examining shells and bullets
Autorzy:
Arciszewski, Robert
Powiązania:
https://bibliotekanauki.pl/articles/22895471.pdf
Data publikacji:
2022
Wydawca:
Centralne Laboratorium Kryminalistyczne Policji
Tematy:
mikroskop cyfrowy
badania identyfikacyjne
wizualizacja śladów
digital microscope
identification research
trace visualization
Opis:
Celem artykułu jest przedstawienie potencjału badawczego w zakresie wizualizacji śladów, jaki daje zastosowanie najnowocześniejszego sprzętu mikroskopii cyfrowej będącego na wyposażeniu Laboratoriów Kryminalistycznych Komend Wojewódzkich Policji. Przedstawione w artykule metody pozwalają na analizę śladów w sposób dający nowe możliwości w ekspertyzach kryminalistycznych z zakresu broni i balistyki, a tym samym mający znaczący wpływ na wnioskowanie o materiale dowodowym i przebiegu zdarzenia. Słowa kluczowe: mikroskop cyfrowy, badania identyfikacyjne, wizualizacja śladów
The purpose of the article is to present the research opportunities, using visualization methods, provided by the use of state-of-the-art digital microscopy equipment on the equipment of the Forensic Laboratories of the Provincial Police Headquarters. The methods presented in the article allow for the analysis of traces in a way that provides new opportunities in conducting research in the course of performing forensic weapons and ballistics expertise, and thus have a significant impact on the inference of evidence and the course of the event.
Źródło:
Problemy Kryminalistyki; 2022, 317; 24-30 (pol), 55-61 (eng)
0552-2153
Pojawia się w:
Problemy Kryminalistyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occurrence of trace metals of toxicological potential in common grass African foxtail (Cenchrus ciliaris)
Autorzy:
Awofolu, O.R.
Iikela, H.
Jansen, C.
Hidinwa, J.
Powiązania:
https://bibliotekanauki.pl/articles/9995.pdf
Data publikacji:
2017
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
environment contamination
pollution
trace metal
occurrence
toxicological property
grass
African foxtail zob.African foxtail grass
buffel-grass zob.African foxtail grass
African foxtail grass
Cenchrus ciliaris
Namibia
Opis:
Anthropogenic activities often result in the introduction of noxious contaminants into the environment with resultant distribution and transfer across the food chain. This study reports on the level of trace metals (Cd, Pb, Cu and Zn) in African foxtail (Cenchrus ciliaris) plant; widely referred to as “common grass” and possible implication across the food chain. Plant samples were collected from stratified study area, processed and analysed using validated acid leaching protocols. Instrumental analysis of the metallic content was by ICP-OES. Quality assurance of the analytical protocol revealed its’ applicability to the environmental samples through metallic recoveries (n=3) in the range of 85.6 – 91 %. The overall mean concentration of analysed metals in samples ranged from 9.34 mg/kg – 38.6 mg/kg; 64.2 mg/kg – 105.2 mg/kg; 0.28 mg/kg – 0.73 mg/kg and 0.54 mg/kg – 16.3 mg/kg for Cu, Zn, Cd and Pb respectively across SCP1-SCP4. Incremental order of analysed trace metals across the SCPs were Cu: SCP1>SCP2>SCP3>SCP4; Zn: SCP1>SCP2>SCP3> SCP4; Cd: SCP1>SCP2>SCP3 = SCP4 and Pb: SCP1>SCP2> SCP3>SCP4. Strong correlation (r > 0.99) was obtained between all the analysed trace metals. Significant difference at (p < 0.05) was found between the analysed metals and SCP 1 while those between the metals and SCPs 2- 4 were non-significant. Accumulation of these metals in ruminants and transfer across the food chain is most probable.
Źródło:
Environment, Earth and Ecology; 2017, 1, 2
2543-9774
2451-4225
Pojawia się w:
Environment, Earth and Ecology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of the Ahmadabad hematite/barite deposit, Iran – studies of mineralogy, geochemistry and fluid inclusions
Autorzy:
Babaei, A. H.
Ganji, A.
Powiązania:
https://bibliotekanauki.pl/articles/94546.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
geochemistry
trace elements
rare earth elements
Semnan
geochemia
pierwiastki śladowe
pierwiastki ziem rzadkich
REE
Opis:
The Ahmadabad hematite/barite deposit is located to the northeast of the city of Semnan, Iran. Geostructurally, this deposit lies between the Alborz and the Central Iran zones in the Semnan Subzone. Hematite-barite mineralisation occurs in the form of a vein along a local fault within Eocene volcanic host rocks. The Ahmadabad deposit has a simple mineralogy, of which hematite and barite are the main constituents, followed by pyrite and Fe-oxyhydroxides such as limonite and goethite. Based on textural relationships between the above-mentioned principal minerals, it could be deduced that there are three hydrothermal mineralisation stages in which pyrite, hematite and barite with primary open space filling textures formed under different hydrothermal conditions. Subsequently, in the supergene stage, goethite and limonite minerals with secondary replacement textures formed under oxidation surficial conditions. Microthermometric studies on barite samples show that homogenisation temperatures (TH) for primary fluid inclusions range from 142 to 256°C with a temperature peak between 200 and 220°C. Salinities vary from 3.62 to 16.70 NaCl wt% with two different peaks, including one of 6 to 8 NaCl wt% and another of 12 to 14 NaCl wt%. This indicates that two different hydrothermal waters, including basinal and sea waters, could have been involved in barite mineralisation. The geochemistry of the major and trace elements in the samples studied indicate a hydrothermal origin for hematite and barite mineralisation. Moreover, the Fe/Mn ratio (>10) and plots of hematite samples of Ahmadabad ores on Al-Fe-Mn, Fe-Mn-(Ni+Co+ Cu)×10, Fe-Mn-SiX2 and MnO/TiO2 – Fe2O3/TiO2 diagrams indicate that hematite mineralisation in the Ahmadabad deposit occurred under hydrothermal conditions. Furthermore, Ba and Sr enrichment, along with Pb, Zn, Hg, Cu and Sb depletion, in the barite samples of Ahmadabad ores are indicative of a low temperature hydrothermal origin for the deposit. A comparison of the ratios of LaN/YbN, CeN/YbN, TbN/LaN, SmN/NdN and parameters of Ce/Ce* and La/La* anomalies of the hematite, barite, host volcanic rocks and quartz latite samples to each other elucidate two important points: 1) the barite could have originated from volcanic host rocks, 2) the hematite could have originated from a quartz latite lithological unit. The chondrite normalised REE patterns of samples of hematite barite, volcanic host rocks and quartz latite imply that two different hydrothermal fluids could be proposed for hematite and barite mineralisation. The comparison between chondrite normalised REE patterns of Ahmadabad barite with oceanic origin barite and low temperature hydrothermal barite shows close similarities to the low temperature hydrothermal barite deposits.
Źródło:
Geologos; 2018, 24, 1; 55-68
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thyroid dysfunctions due to lithium treatment in bipolar disorder: changes in oxidative stress, trace elements, and hemorheological parameters
Autorzy:
Bahtiyar, N.
Serinkan Cinemre, F.
Cinemre, H.
Kiziler, A.
Atagun, M.
Gulyasar, T.
Aydemir, B.
Powiązania:
https://bibliotekanauki.pl/articles/1192380.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
bipolar disorder
lithium treatment
thyroid dysfunction
oxidative stress
trace
elements
hemorheology
Opis:
Lithium is one of the most widely used medications for the treatment of bipolar disorder (BD). It also has some side effects on thyroid functions. We aimed to investigate the role of oxidative stress, trace elements, and hemorheological parameters on the pathophysiology of thyroid dysfunctions developed by lithium treatment in patients with BD. Patients with BD were divided into three groups: patients that non-lithium-treated, lithium-treated patients for 4-6 weeks, and lithium-treated patients for 40-68 weeks. Blood samples for analysis were taken before and after the treatment period. After analysis, patients were divided into six groups: non-treatment BD group (Group 1); short-term lithium-treatment group that did not develop thyroid dysfunctions (Group 2); short-term lithium-treatment group that developed hyperthyroidism (Group 3); longterm lithium treatment group that developed hypothyroidism (Group 4), long-term lithium-treatment group that developed hyperthyroidism (Group 5), and long-term lithium-treatment group that did not develop thyroid dysfunctions (Group 6). Plasma and whole blood viscosity levels were significantly increased in Groups 4 and 6 compared to Groups 1, 2, and 3. Hemoglobin levels were lower in Group 4 than in Groups 1, 2, and 5. Fibrinogen values were higher in Groups 4 and 5 than Group 1. Plasma and erythrocyte malondialdehyde levels were higher in Group 4 than In Groups 1, 2, 3, and 5. Also, they were increased in Group 6 in comparison with Groups 2 and 3. Erythrocyte glutathione levels were lower in Groups 4 and 6 than Groups 1, 2, 3 and 5. Plasma protein carbonyls levels were higher in Group 4 than in Group 1, or in Group 5 than in Groups 1, 2, and 3, as well as in Group 6 than Groups 1, and 2. Serum zinc levels were higher in Groups 2, 3 and 6 than in Group1. Serum copper levels increased in Groups 2, 4 and 6 in comparison with Group1. The results of this study indicate that oxidative stress increased with treatment time in lithium-induced thyroid dysfunctions. Also, whole blood viscosity, plasma viscosity, fibrinogen, zinc, and copper levels were affected by lithium treatment and treatment duration induced thyroid dysfunctions.
Źródło:
Journal of Elementology; 2020, 25, 3; 863-878
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 350

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