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Diffusion and sorption of Cs$$^{+}$$, I$$^{-}$$ and HTO in samples of the argillaceous Wakkanai Formation from the Horonobe URL, Japan; Clay-based modeling approach

Tachi, Yukio; Yotsuji, Kenji; Seida, Yoshimi*; Yui, Mikazu

Diffusion and sorption behaviors of Cs$$^{+}$$, I$$^{-}$$ and HTO in samples of the Wakkanai Formation from Horonobe URL were investigated as a function of ionic strength (IS) of synthetic groundwater by through-diffusion and batch sorption experiments. The $$D$$$$_{rm e}$$ values showed cation excess and anion exclusion effects, which were strongly dependent on IS; $$D$$$$_{rm e}$$ for Cs$$^{+}$$ decreased as IS increased, $$D$$$$_{rm e}$$ for I$$^{-}$$ showed the opposite dependency and $$D$$$$_{rm e}$$ for HTO showed no dependence. The Kd values for Cs determined by through-diffusion and batch experiments were in good agreement and decreased with IS as a result of competitive ion exchange. Diffusion and sorption behaviors were interpreted based on the clay-based modeling approach in assuming the clay components of illite and smectite control diffusion and sorption mechanisms. The model predicted the $$D$$$$_{rm e}$$ and Kd trends obtained by the series of experiments reasonably well, implying the key contribution of the clay particle and nano-size pore for ionic migration.

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Category:Geochemistry & Geophysics

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