Abstract
The composition of cadmium (Cd) compounds in soils of both technogenic landscapes and a model experiment were studied using the sequential fractionation method. A model experiment was conducted with artificial soil contamination by easily soluble Cd compounds. Pollution doses simulated the level of pollutant content in the studied soils of the impact zones and corresponded to low, high, and very high pollution. Fractions revealed both general features and specific metal distribution characteristics in anthropogenically polluted soil and soil under artificial pollution. The largest amount of Cd in the soils was concentrated in the residual fraction (up to 60%). With increasing pollution level, the proportion of the residual fraction decreases and the proportion of mobile compounds (exchangeable fraction and carbonate fraction) of the metal increases (up to 22% and 18%, respectively). In contaminated soil, carbonates and Fe-Mn oxides play the main role in the Cd fractional distribution. Fractional distribution of Cd shows general regularities both under anthropogenic pollution and under artificial contamination; however, metal demonstrated high mobility at artificially contamination.
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