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[FEATURES OF THE CONTENT OF MOVABLE FORMS OF HEAVY METALS AND SELENIUM IN SOILS OF THE YAROSLAVL REGION].

https://arctichealth.org/en/permalink/ahliterature275150
Source
Gig Sanit. 2016;95(4):339-43
Publication Type
Article
Date
2016
Author
E A Bakaeva
A V Eremeyshvili
Source
Gig Sanit. 2016;95(4):339-43
Date
2016
Language
Russian
Publication Type
Article
Keywords
Environmental Health - methods - statistics & numerical data
Environmental Monitoring - methods
Environmental Pollution - analysis - prevention & control - statistics & numerical data
Humans
Metals, Heavy - analysis - chemistry
Russia
Selenium - analysis - chemistry
Snow - chemistry
Soil Pollutants - analysis - chemistry
Abstract
With the use of the method of inversion voltammetry there was analyzed the content of movableforms of trace elements: (selenium, zinc, copper lead, cadmium) in soils in the Yaroslavl district of the Yaroslavl region, and also content of zinc, copper lead, cadmium in soils and snow cover in the city of Yaroslavl. According to values of concentrations of movable compounds in soils determined trace elements can be ranked into the following row: zinc > lead > copper > selenium > cadmium. There was revealed insufficient if compared with literature data concentrations, content of movable compounds of selenium, copper and zinc in examined explored soils. The maximal concentrations of lead are revealed in the close proximity to both the city of Yaroslavl and large highways of the city. It indicates to the anthropogenic pollution of soils by this element.
PubMed ID
27430063 View in PubMed
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Sorption and speciation of selenium in boreal forest soil.

https://arctichealth.org/en/permalink/ahliterature282812
Source
J Environ Radioact. 2016 Nov;164:220-231
Publication Type
Article
Date
Nov-2016
Author
Mervi Söderlund
Juhani Virkanen
Stellan Holgersson
Jukka Lehto
Source
J Environ Radioact. 2016 Nov;164:220-231
Date
Nov-2016
Language
English
Publication Type
Article
Keywords
Adsorption
Finland
Selenic Acid
Selenious Acid
Selenium - analysis - chemistry
Soil - chemistry
Soil Pollutants - analysis - chemistry
Taiga
Abstract
Sorption and speciation of selenium in the initial chemical forms of selenite and selenate were investigated in batch experiments on humus and mineral soil samples taken from a 4-m deep boreal forest soil excavator pit on Olkiluoto Island, on the Baltic Sea coast in southwestern Finland. The HPLC-ICP-MS technique was used to monitor any possible transformations in the selenium liquid phase speciation and to determine the concentrations of selenite and selenate in the samples for calculation of the mass distribution coefficient, Kd, for both species. Both SeO3(2-) and SeO4(2-) proved to be resistant forms in the prevailing soil conditions and no changes in selenium liquid phase speciation were seen in the sorption experiments in spite of variations in the initial selenium species, incubation time or conditions, pH, temperature or microbial activity. Selenite sorption on the mineral soil increased with time in aerobic conditions whilst the opposite trend was seen for the anaerobic soil samples. Selenite retention correlated with the contents of organic matter and weakly crystalline oxides of aluminum and iron, solution pH and the specific surface area. Selenate exhibited poorer sorption on soil than selenite and on average the Kd values were 27-times lower. Mineral soil was more efficient in retaining selenite and selenate than humus, implicating the possible importance of weakly crystalline aluminum and iron oxides for the retention of oxyanions in Olkiluoto soil. Sterilization of the soil samples decreased the retention of selenite, thus implying some involvement of soil microbes in the sorption processes or a change in sample composition, but it produced no effect for selenate. There was no sorption of selenite by quartz, potassium feldspar, hornblende or muscovite. Biotite showed the best retentive properties for selenite in the model soil solution at about pH 8, followed by hematite, plagioclase and chlorite. The Kd values for these minerals were 18, 14, 8 and 7 L/kg, respectively. It is proposed that selenite sorption is affected by the structural Fe(II) in biotite, which is capable of inducing the reduction of SeO3(2-) to Se(0). Selenite probably forms a surface complex with Fe(III) atoms on the surface of hematite, thus explaining its retention on this mineral. None of the minerals retained selenate to any extent.
PubMed ID
27521902 View in PubMed
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