FORMS OF THE COMPOUNDS OF LEAD, CADMIUM AND ZINCIN THE SOILS OF THE SOUTH OF WESTERN SIBERIA
Using the method of parallel extractions regional peculiarities in the content and ratio of structural/insoluble and exchangeable forms of lead, cadmium and zinc in the background, anthropogenically transformed and contaminated soils of the south of Western Siberia were revealed. The total content as well as the content of labile (exchangeable) forms of compounds of heavy metals were found to vary widely. The differences in the behavior of different metals. In the uncontaminated and anthropogenically transformed soils Cd and Zn were found predominantly in structural forms, however, the share of loosely associated connections Pb is 52–77 % of the total content. The spatial distribution of heavy metals labile forms in the anthropogenically transformed soils was shown to correlate with their quantitative and qualitative composition in the uncontaminated soils of the region. No statistically significant difference between sandy and loamy soils in the heavy metals content was found. In the exchangeable forms for a fraction of Cd accounted for about half of the amount of all loosely associated connections, the fraction of specifically sorbing compounds which are potentially available for plants of items that is dominant for Pb and Zn. Certain regularity in the group composition of Cd, Pb и Zn compounds was revealed in technogenically contaminated soils, thus confirming high informative value of HM group composition for evaluating soil ecological status. Sandy soils in the south of West Siberia often have increased permissible concentrations of Zn due to specific regional geochemistry, rather than soil contamination. The latter can be more accurately detected by relative content of labile forms of chemical elements in soil.
Key words: Western Siberia, soils, heavy metals, form compounds, loosely associated compounds.
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Authors: Siromlya T.I.