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Speciation of 210Po and 210Pb in Radioactively Contaminated Soils

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Abstract

Differences in the migration ability of 210Po and 210Pb were established by the chemical fractionation of samples of radium-contaminated podzolic and alluvial-soddy soils, therewith the nature of differences did not depend on the type of soil. In the water-soluble fractions, as well as in the case of 210Po, in the exchangeable (1 M CH3COONH4, pH 7) and carbonate (1 M CH3COONH4, pH 5) fractions, the amount of radionuclides was insignificant (less than 1% of their total specific activity in samples). The highest proportion of 210Po was found in the extracts Fe and Mn oxides and hydroxides (0.1 M NH2OH·HCl in 25% CH3COOH), organic matter (30% H2O2 + HNO3 up to pH 2), and amorphous silicates (0.2 M NaOH). The 210Pb isotope was detected in significant amounts in all migrating speciations, except for the water-soluble one. Most of all, it was found in the organic matter extracts (up to 19.7% of the total content in soils). In the insoluble residue fractions, the proportion of 210Po was 72.0 and 82.8%, that of 210Pb was 50.0 and 76.4% of their specific activity in podzolic and alluvial-soddy soils, respectively.

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Funding

The studies were carried out within the framework of the state order IB FRC Komi Scientific Center, Ural Branch, Russian Academy of Sciences no. 122040600024–5.

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  1. Institute of Biology, Komi Science Centre, Ural Branch, Russian Academy of Sciences, 167982, Syktyvkar, Russia

    L. M. Shaposhnikova & N. G. Rachkova

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  1. L. M. Shaposhnikova
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  2. N. G. Rachkova
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Correspondence to L. M. Shaposhnikova.

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Translated from Radiokhimiya, No. 1, pp. 93–100, December, 2023 https://doi.org/10.31857/S0033831123010136

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Shaposhnikova, L.M., Rachkova, N.G. Speciation of 210Po and 210Pb in Radioactively Contaminated Soils. Radiochemistry 65, 122–129 (2023). https://doi.org/10.1134/S1066362223010174

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