Features of 90Sr behavior in Crimean lakes with different salinity of their water environment

• 作者: OA N.Yu.Mirzoeva S.I.Arkhipova V.Yu.Proskurnin O.N.Miroshnichenko I.N.Moseichenko A.O.Kovalevsky Institute of Biology of the Southern Seas of RAS
• 来源期刊: 地球化学学报(英文）
• 学科: 地球科学
• 年，卷（期）: 2025,（1）
• 页码范围: 89-102
• 页数: 14页
• 语种: 中文

摘要

The comparative study of technogenic 90Sr behavior features in Crimea lakes' ecosystems with different levels of salinity was carried out in 2016-2021.Two sources of 90Sr input were identified for all the studied lakes:the primary source concerned with atmospheric fallout immediately after the Chernobyl NPP accident and the secondary long-term input of this radionuclide by waterway.The half-life of the 90Sr concentration in the water of the hypers aline Lake Sasyk-Sivash was estimated to vary from 0.8 to 1.1 years after the closure of the North Crimean Canal（NCC）.Biogeochemical processes in the lake under the absence of the secondary source of the radionuclide input were shown to decrease in the 90Sr residence time in the water column by 131 times.For brackish water bodies,a significant factor influencing the radionuclide concentration in ecosystems of lakes was the pH of their water,while for hypers aline lakes the level of water salinity was the main factor determining 90Sr behavior.The concentration of 90Sr in bottom sediments of studied lakes depended mainly on this radionuclide concentration in a water environment.Calculated 90Sr distribution factors（Kd） for studied lakes' bottom sediments varied in a range of n·10～0÷n·10～2 for hypersaline lakes and of n·10～1÷n·10～2 for lakes with brackish waters.Due to the closure of the NCC,the 90Sr redistribution took place in lake ecosystems only under the geochemical processes within the water bodies themselves.The results obtained in this work are of particular importance as a starting point or a basis for further radioecological studies of the Crimean inland waters after the reopening of the NCC and the Dnieper waters re-entering the territory of Crimea in 2022after the 8 years of their absence.