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The Effect of Silica Sand Content on Diffusion of CO$$_{3}$$$$^{2-}$$, Cl$$^{-}$$ and I$$^{-}$$ ions in Compacted Bentonite

石寺 孝充; 宮本 真哉*; 佐藤 治夫

Ishidera, Takamitsu; Miyamoto, Shinya*; Sato, Haruo

None

For safety assessment of TRU waste disposal, the effective diffusion coefficients (De) for CO$$_{3}$$$$^{2-}$$, Cl$$^{-}$$ and I$$^{-}$$ ions in compacted bentonite (Kunigel V1) were determined as a function of silica sand contents under hyper alkaline condition. The obtained De values for three diffusants were on the order of 10$$^{-13}$$ - 10$$^{-11}$$ m$$^{2}$$/s and increased with increasing silica sand content. The effective porosity for diffusion of Cl$$^{-}$$ and I$$^{-}$$ ions, estimated from the rock capacity factor values, were also increased with increasing silica sand content. This close relationship indicated that the increases in the De values were due to the increase in effective porosity with increasing silica sand content. In the case of CO$$_{3}$$$$^{2-}$$ ion, the rock capacity factor values were higher than those for Cl$$^{-}$$ and I$$^{-}$$ ions. The Da values for CO$$_{3}$$$$^{2-}$$ ion were approximately one order of magnitude lower than those for Cl$$^{-}$$ and I$$^{-}$$ ions. The differences in these behaviors suggested a possibility of isotopic exchange of $$^{14}$$C with the carbon of calcite contained in Kunigel V1.

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