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Report No.
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Diffusion of cesium and iodine in compacted sodium montmorillonite under different saline conditions

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

Diffusion of Cs and I in compacted montmorillonite were examined from the viewpoints of mechanistic understanding of salinity effects. The effective diffusivity and capacity factor for Cs and I were measured in compacted montmorillonite saturated with 0.01, 0.1 and 0.5M NaCl by through-diffusion experiments, coupled with multiple curve analysis including tracer depletion, breakthrough, and depth concentration curves. The De values obtained for Cs decreased as salinity increased, and those for I showed the opposite dependency. The distribution coefficient of Cs decreased as salinity increased. The diffusion and sorption parameters for Cs were also obtained by in-diffusion and batch sorption experiments, showing good agreement with those by the through-diffusion. The diffusion model based on electrical double layer theory predicted the salinity dependence of De reasonably well, the apparent diffusivity which includes sorption effect was also interpreted by the sorption coupled model.

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