Abstract
Profile distributions of 90Sr for periods of 10–25 years after aerogenic pollution were measured in six different soils (from automorphic to hydromorphic (dark gray forest soil on dense rocks, gray forest medium loam, leached chernozem, chernozem-meadow solonchak, meadow-marsh solod, dark gray forest solod) in 20 repetitions. The physical, chemical, physicochemical properties of soils, as well as the forms of 90Sr occurrence (water-soluble, exchangeable, and non-exchangeable), from which the distribution coefficients were estimated, were determined. Profile distributions of 90Sr are adequately described by dynamic model diffusion, convective diffusion, and diffusion with irreversible sorption for each period of migration. The parameters of these migration models were estimated for a diffusion coefficient of (2–7) × 10–8 cm2/s, and the coefficient of convective diffusion is slightly less; the rate of directed downward transport is 0.05–0.20 cm/year. Estimates of diffusion parameters tended to increase with increasing time of migration. It was shown that complete fixation of 90Sr in these soils did not occur 25 years after contamination, and the estimate of the period of almost complete fixation for leached chernozem was 730–1460 years. It was found that the expected inverse relationship between the rate of migration and the degree of sorption of 90Sr is limited in this sample of soils.
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Grakovsky, V.G., Frid, A.S. Migration of 90Sr in the Soils of the East Ural Radioactive Trace (EURT). Russ. Agricult. Sci. 48 (Suppl 1), S126–S138 (2022). https://doi.org/10.3103/S1068367422070126
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DOI: https://doi.org/10.3103/S1068367422070126