Biogeochemical behavior of ^(210)Po in the aquatic ecosystem of the North Crimean Canal and adjacent irrigated soils  

作　　者：A.A.Korotkov N.Yu.Mirzoeva O.N.Miroshnichenko I.N.Moseichenko 

机构地区：[1]A.O.Kovalevsky Institute of Biology of the Southern Seas of RAS,Sevastopol,Russian Federation

出　　处：《Acta Geochimica》2025年第2期314-324,共11页地球化学学报(英文)

基　　金：supported by the Russian Science Foundation,grant number 23-26-00128,“The role of the irrigation system of the North Crimean Canal in the transfer of long-lived radionuclides of Chernobyl origin,heavy metals,as well as hydrocarbons from the Dnieper water to irrigated farmlands of the Crimea.”。

摘　　要：The main objectives of this study were to investigate the distribution features of the ^(210)Po in abiotic(water and bottom sediments)and biotic(zooplankton,mollusks,fish)components of the North Crimean Canal(NCC)aquatic ecosystem and adjacent irrigated soils as well as assessment of the doses received by water organisms from α-radiation of absorbed ^(210)Po.The samples were processed using standard radiochemical methods accepted in international practice.The activity of ^(210)Po in the samples was measured using the alpha-spectrometric OCTETE Plus complex(ORTEC-AMETEK,USA).The measurement error did not exceed 20%.Activity concentration of ^(210)Po in the studied objects decreased in the following rank:suspended matter(73.6 Bq/kg d.w.)>soils(32.5 Bq/kg d.w.)≈bottom sediments(32.1 Bq/kg d.w.)>mollusks(23.4 Bq/kg w.w.)>fish(6.4 Bq/kg w.w.).The ^(210)Po distribution coefficient(K_(d))values in water between suspended matter and its dissolved parts varied within the 1.4×10^(4)-1.4×10^(5) L/kg range.The concentration factors(CF)of ^(210)Po for hydrobionts of the NCC were in the range 10^(3)-10^(4) L/kg.The calculated absorbed radiation doses from ^(210)Po alpha radiation for the hydrobionts of the North Crimean Canal were significantly below the recommended dose limits.

关 键 词：^(210)Po North Crimean Canal ecosystem Water HYDROBIONTS Bottom sediments Irrigated soils Equivalent dose 

分 类 号：S15[农业科学—土壤学]