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The mineral, grain size, and chemical compositions of bentonites and the cation exchange capac ity of their different genetic varieties are described with an estimation in static conditions of their sorption capacity for Cs and Sr ions. The compositions of betonites of different genetic types are correlated with their sorptive properties. The quantitative data on bentonites are compared with sorptive properties of loam that contains a low montmorillonite admixture.

Sorption properties of the soil layer at the base of the ash disposal site of the Sakhalin GRES-2 at the design stage of the facility were determined. Water extracts of the ash from the coal that will be used at the facility were analyzed to identify the potential elements-pollutants able to migrate with atmospheric precipitation through the soil. The model solution was developed based on these data. The soil sorption capacity in relation to the identified pollutants and the level of their potential desorption have been determined in static and dynamic conditions.

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