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Integrated sorption and diffusion model for bentonite, 2; Porewater chemistry, sorption and diffusion modeling in compacted systems

Tachi, Yukio; Yotsuji, Kenji; Suyama, Tadahiro; Ochs, M.*

The integrated sorption and diffusion (ISD) model for compacted bentonites was developed based on the consistent combination of (1) the porewater chemistry model, (2) the thermodynamic sorption model (TSM), and (3) the diffusion model based on the electrical double layer (EDL) theory. This ISD model was successfully tested for various actinides with a complex chemistry (Np(V), Am(III), U(VI) under conditions where carbonate complexes are formed), by using published diffusion and sorption data ($$D$$$$_{rm a}$$, $$D$$$$_{rm e}$$, $$K$$$$_{rm d}$$) as a function of partial montmorillonite density. Quantitative agreements were observed as same as monovalent cations (Cs$$^{+}$$, Na$$^{+}$$), anions (Cl$$^{-}$$, I$$^{-}$$, TcO$$_4^{-}$$) previously reported. The ISD model could be therefore seen to be able to predict sorption and diffusion behavior of various complex radionuclides in compacted bentonites.

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Category:Nuclear Science & Technology

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