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Influence of Na-Al phosphate glass leachates on clays sorption behavior toward radionuclidesтезисы доклада Тезисы
- Авторы: Konevnik Yu V., Martynov K.V., Kulyukhin S.A., Zakharova E.V.
- Сборник: Book of abstracts. XXII Mendeleev Congress on General and Applied Chemistry, October 7-12, 2024. In 7 volumes
- Том: 5
- Тезисы
- Год издания: 2024
- Место издания: “Admiral Print” LLC Moscow
- Первая страница: 180
- Аннотация: The presence of leaching products in the liquid phase of an alumophosphate matrix for radioactive waste immobilization significantly affects the behavior of radionuclides, both fission products – strontium and cesium, and actinides.Cesium sorption on clays slightly decreases in the presence of leaching products, presumably due to an increase in ionic strength, the main contribution to which is made by sodium and phosphate ions. Strontium sorption on bentonites depends more on the properties of the clay than on the composition of the liquid phase, but as the concentration of phosphates increases, the proportion of firmly fixed forms increases.Uranium and neptunium in oxidation states U(VI) and Np(V) are considered as mobile radionuclides in environmental conditions due to their low distribution coefficients from groundwater, which are several orders of magnitude smaller than the corresponding values for plutonium or americium. The presence of leaching products of alumophosphate glass in the liquid phase significantly increases their sorption on bentonites and the proportion of strongly bound forms of radionuclides, which undoubtedly has a positive effect on the efficiency of the anti-migration clay engineering barrier.Plutonium and americium have high distribution coefficients on clays in the conditions of a high-level radioactive waste repository. The presence of leaching products of alumophosphate glass slightly increases sorption, while the proportion of strongly bound forms increases with the concentration of phosphate ions.The presence of leaching products of phosphate glass in the liquid phase does not negatively impact the ability of engineering barriers based on bentonite clays to prevent radionuclide migration from the radioactive waste repository. In some cases, it significantly enhances the barrier properties of the studied materials in the conditions of a high-level radioactive waste repository towards such mobile radionuclides uranium and neptunium.
- Добавил в систему: Кулюхин Сергей Алексеевич