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Comparison of Methods for Assessment of Radionuclide Speciation in Soils

  • RADIONUCLIDES
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Abstract

A comparison of sequential extraction methods proposed by F.I. Pavlotskaya [1, 2] and A. Tessier [3] for fractionation of technogenic (137Cs and 90Sr) and natural (226Ra, 232Th, and 238U) radionuclides from soils was performed. It is shown that both methods provide comparable results in the extraction of various forms of occurrence of technogenic radionuclides. Furthermore, both methods indicate a significantly higher availability of 90Sr to plants and its greater ability to migrate with downward soil solution flows in comparison with 137Cs. However, when used for the assessment of the occurrence forms of natural heavy radionuclides, the two methods provide inconsistent results. The Tessier sequential extraction method indicates higher contents of compounds available to plants and mobile compounds in comparison with the Pavlotskaya method. A possible reason behind this may be the soil chemistry complexity of radionuclides such as 232Th and 238U that feature polyvalence and a strong tendency for hydrolysis and complex formation; in addition, their behavior may be affected by various carriers. These elements form a broad range of compounds that change one into another with changes in the chemical conditions; this complicates accurate comparison of the composition of their forms extracted by reagents used in the above methods.

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Funding

This study was supported by the Russian Foundation for Basic Research, project no. 18-04-00584 A.

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Correspondence to D. V. Manakhov.

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The authors declare that they have no conflict of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.

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Translated by L. Emeliyanov

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Manakhov, D.V., Emelyanov, A.M., Karpukhin, M.M. et al. Comparison of Methods for Assessment of Radionuclide Speciation in Soils. Biol Bull Russ Acad Sci 46, 1671–1678 (2019). https://doi.org/10.1134/S1062359019120057

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  • DOI: https://doi.org/10.1134/S1062359019120057

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