Distribution of Polonium-210 in water and suspended matter in Crimea water bodies with different salinity
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Abstract
The paper presents the results of monitoring of the natural radionuclide polonium-210 (210Po) in nine salt lakes, located in different regions of the Crimean Peninsula, carried out in 2020–2021. The purpose of the research was to study the features of 210Ро distribution between dissolved and suspended phases in the waters of Crimean lakes, characterized by different salinity values. Polonium-210 activity concentrations were determined using radiochemical techniques and alpha-spectrometric measurements. Dissolved 210Ро activity concentrations varied from 1.2 to 22.9 mBq·L–1 in lakes of different salinity, with the highest values obtained in hypersaline lakes. Concentrations of 210Po in suspended matter were relatively high and did not depend on the salinity of the medium. The highest 210Po activity concentration on suspended matter was obtained in the brackish water lake Kyzyl-Yar — 411.7 Bq·kg–1 dry weight. Polonium associated with suspended matter is, most likely, the main form of 210Po entering the studied lakes. 210Po Partitioning Coefficients between dissolved and particulate phases varied in a range of 103÷105 kg/L.
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