Mobility of radionuclides in different nuclear waste repository barrier systems is strongly determined by solubility and mineral-water interface reactions. Classical batch type experiments, spectroscopic and quantum chemistry studies provide complementary and detailed insight into a multitude of different solid-liquid interaction mechanisms on a molecular scale. Beside classical surface sorption phenomena, surface induced redox reactions and surface incorporation determine the fate of actinide and long-lived fission products. Reactions may either contribute to enhanced mobilization in case of radionuclide interaction with mobile colloidal species or strong retention if sorption onto mineral surfaces is considered. The present contribution discusses recent investigations related: - to radionuclide reactions with container corrosion products in the near field of a nuclear waste repository, - the impact of enhanced salinity on actinide sorption on various mineral surfaces as well as - the role of surface sorption on actinide redox state and - kinetic aspects of colloid-mediated actinide transport reactions.

Molecular scale investigations towards actinide retention at mineral surfaces

249th National Meeting (2015)

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