Abstract
The influence of different agricultural treatments on the contents of Cd, Zn, and Co in the organic matter and humic acids of soddy-podzolic and dark gray forest soils was studied in long-term field experiments. The use of gel chromatography proved the complicated molecular-weight composition of the humic acids in all the studied soils. The contents of heavy metals and their distribution by the molecular-weight fractions of humic acids were determined in the experimental soils and in the virgin podzolic soils. The complex nature of organomineral compounds of Cd and Zn with humic acids was shown by means of gel filtration. The thermodynamic stability of the organomineral complexes increased with the increasing weight of the initial molecular-weight fractions of humic acids.
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Original Russian Text © A.I. Karpukhin, N.N. Bushuev, 2007, published in Pochvovedenie, 2007, No. 3, pp. 292–301.
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Karpukhin, A.I., Bushuev, N.N. Distribution of heavy metals by the molecular-weight fractions of humic acids in the soils of long-term field experiments. Eurasian Soil Sc. 40, 265–273 (2007). https://doi.org/10.1134/S1064229307030040
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DOI: https://doi.org/10.1134/S1064229307030040