Radionuclides Distribution and its Sorption Behavior in the Surface Layer of the Kara Sea Bottom Sediments

• Published in: Geochemistry international Vol. 57; no. 11; pp. 1213 - 1220
• Main Authors: Kuzmenkova, N. V., Krupskaya, V. V., Duriagina, E. V., Semenkov, I. N., Vinokurov, S. E.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.11.2019; Springer; Springer Nature B.V
• Subjects: Bottom sediments; Caesium 137; Cesium 137; Cesium isotopes; Cesium radioisotopes; Clay; Clay minerals; Deionization; Earth and Environmental Science; Earth Sciences; Expeditions; Geochemistry; Ion exchange; Kinetics; Minerals; Nuclear energy; Radioisotopes; Radionuclide kinetics; Sea-water; Seawater; Sediment; Sediments; Sediments (Geology); Sorption; Strontium; Strontium 90; Strontium radioisotopes; Surface layers; Cs; AMK-66; bottom sediments; radionuclides sorption; Novaya Zemlya; Sedova bay; Am; Sr
• ISSN: 0016-7029; 1556-1968
• DOI: 10.1134/S0016702919110041

—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 137 Cs is sorbed mainly by an ion exchange mechanism because of the clay minerals presence in sediments. At the same time, 243 Am and 90 Sr sorbed from seawater by the surface complexation mechanism. It has been established that the sorption kinetics of 243 Am, 137 Cs, and 90 Sr 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.