Аннотация:Abstract:
Under model experiment conditions, the mechanisms of chemical interaction of 90Sr with soil organic matter were established. The radionuclide was introduced in soil examples of main soil-types widespread on the European territory of the Russian Federation. It was found that from 40 to 60% of the radionuclide extracted in exchangeable chemical form. In addition, fulvic acids (FA) (fractions I and Ia) absorbed a significant amount of the radionuclide: 25–35%. It was shown that 90Sr is available for forming chemical compounds with nonspecific organic matter with molecular weight (M) ranging from 180 to 500 g/mol, without reference to soil type. An essential part of radioactive strontium, 18–24% (from introduced 90Sr), which was associated with high-molecular fraction (M > 500 g/mol), was detected in chernozems, chestnut soil, and peat soil. In soddy-podzolic soil and light-gray forest soil, it was found mostly (33–34%) with mineral compounds (M < 180 g/mol).
Keywords:
90Sr radionuclide soil types organic matter molecular weight chemical compound chemical form fulvic acids