Sorption of Np, Pu, Am, Sr, Cs on the Mineral Phases of the Rocks of the Nizhnekansky Granitoid Massif under Conditions of Underground Repositories for Radioactive Wastes

• Published in: Radiochemistry (New York, N.Y.) N.Y.), 2022-12, Vol.64 (6), p.740-749
• Main Authors: Rodionova, A. A., Petrov, V. G., Vlasova, I. E.
• Format: Article
• Language: English
• Subjects: Americium; Biotite; Calcite; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Hydroxyapatite; Massifs; Mica; Muscovite; Neptunium; Nuclear Chemistry; Phases; Plutonium; Radioactive waste disposal; Radioisotopes; Rocks; Sorption; Strontium
• ISSN: 1066-3622; 1608-3288
• DOI: 10.1134/S106636222206011X

The sorption properties of mineral phases that constitute the rocks of the Yeniseysky area of the Nizhnekansky granitoid massif toward Np, Pu, Am, Sr, and Cs were studied under conditions of underground radioactive waste disposal. As a result of sorption experiments, sorption kinetic curves were obtained, and the distribution coefficients ( K d ) of radionuclides on mineral phases were determined. The resulting data made it possible to evaluate the differences in the sorption properties of minerals towards the studied radionuclides. For each radionuclide, with the exception of americium, it was possible to establish the most effective mineral phases in terms of sorption: for Np(V)—hydroxyapatite and calcite, for Pu(V)—hydroxyapatite and magnetite, for Sr(II)—biotite and hydroxyapatite, for Cs(I)—biotite and muscovite. Americium was sorbed quantitatively on all mineral phases, except for biotite and quartz.