Results of zeta potential measurements by electroosmosis with site-specific waters and sedimentary rocks from strata overlying the Gorleben salt dome are given and compared with sorption data of radionuclides obtained in batch experiments. It is shown that zeta potentials of sediment-groundwater systems in spite of being lower than the corresponding surface potentials are a sensitive indicator of interface reactions depending on the type of the sediment, ionic strength of waters, pH and temperature. Moreover, it is demonstrated that sorption data and, additionally, the influence of various parameters can often be understood by taking into account variable electrostatic forces between charged surfaces and nuclide species.
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Meier, H., Zimmerhackl, E., Zeitler, G. et al. Significance of Electrostatic Sorption in the Retardation of Radionuclides Released from a Repository. MRS Online Proceedings Library 353, 1061–1068 (1994). https://doi.org/10.1557/PROC-353-1061