Journal
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
Volume 219, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2020.106270
Keywords
Po-210; Crimean salt lakes; The Black Sea; Water; Bottom sediments; Hydrobionts; Dose assessment
Categories
Funding
- Russian Scientific Foundation [18-16-00001]
- state task of IBSS Molismological and biogeochemical fundamentals of marine ecosystems homeostasis [AAAA-A18-118020890090-2]
- state task of IBSS Superposition of physical, chemical and biological processes in forming the quality of the marine environment and the functional state of hydrobionts in the Azov-Black Sea basin [AAAA-A18-118020790154-2]
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This paper presents the results of radioecological monitoring study of natural radionuclide Po-210 in 11 lakes located in different regions of the Crimean peninsula. These investigations of the Crimean salt lakes were conducted for the first time in the history. The main objectives of this work were: to determine the features of the Po-210 behavior in the salt lakes ecosystems, as well as calculation of the doses received by the lakes hydrobionts from alpha-radiation of absorbed Po-210. Concentrations of Po-210 in the water, suspended matter, the bottom sediments and biota were determined by radiochemical processing and alpha-spectroscopy measurements. The concentrations of dissolved Po-210 in the water of investigated lakes were in 0.9-327.1 times higher than in the Black Sea closest regions. The highest concentrations of Po-210 in water were determined in the lakes of the Kerchenskaya group. These lakes are located on the territory of Crimea where oil is produced. The Po-210 (.)activity concentrations in the bottom sediments from Crimean salt lakes were comparable with those of the Black Sea coastal zone. Concentration ratio (CR) of polonium in suspended matter ranged from 10 to 10(4) for different lakes. A significant trend in a decrease of CR values of Po-210 for suspended matter with increasing water salinity was revealed. High levels of Po-210 accumulation were noted for adult crustacean Artemia spp. (typical inhabitant of the Crimean saline lakes). The CR of Po-210 for adult Artemia spp. reached 10(5) while the CR of this radionuclide by their cysts was significantly lower. The absorbed doses from Po-210 alpha-radiation calculated for adult Artemia spp. were more than 60 times lower than the permissible dose rate for biota (IAEA, 1992). The obtained results will be used to identify the biogeochemical peculiarities in behavior of the main dose-formative radionuclide Po-210, in the water ecosystems with different salinity, including water reservoirs poorly studied in the radioecological aspect and having extreme condition for the existence of lots of species of hydrobionts, such as hypersaline Crimean lakes.
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