Abstract—The sorption characteristics of the Kara sea bottom sediments were investigated. The sediments were collected during scientific expedition of the R/V Akademik Mstislav Keldysh (Cruise AMK-66). The mineral and fraction composition of the sediments was determined. It has been found that 137Cs is sorbed mainly by an ion exchange mechanism because of the clay minerals presence in sediments. At the same time, 243Am and 90Sr sorbed from seawater by the surface complexation mechanism. It has been established that the sorption kinetics of 243Am, 137Cs, and 90Sr is about 20 hours, 2 hours, and less than an hour, respectively. The Cs and Am sorption isotherms in experiments with sea and deionized water are described by the Henry equation. The Sr behavior in the deionized and sea water is described by the Langmuir and Freindlikh equations, respectively.
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ACKNOWLEDGMENTS
We are grateful to the participants of expedition АМК-66 and, personally, A. Yu. Miroshnikov, for help and assistance in obtaining bottom sediment samples from the Kara Sea. Researchers from the Radiochemical Department, Chemical Faculty, Moscow State University, and the Belov Laboratory of Crystal Chemistry of Minerals of Insitute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, are thanked for assistance and help at different stages of study.
Funding
This work was performed in the framework of the State Task of the Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences (0137-2016-0022). Mineral composition analysis of marine sediments was carried out with the support of the project of the Russian Foundation for Basic Research (18-29-12115-mk).
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Kuzmenkova, N.V., Krupskaya, V.V., Duriagina, E.V. et al. Radionuclides Distribution and its Sorption Behavior in the Surface Layer of the Kara Sea Bottom Sediments. Geochem. Int. 57, 1213–1220 (2019). https://doi.org/10.1134/S0016702919110041
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DOI: https://doi.org/10.1134/S0016702919110041