Refine your search�ソスF     
Report No.
 - 

Diffusion and sorption of Cs$$^{+}$$, Na$$^{+}$$, I$$^{-}$$ and HTO in compacted sodium montmorillonite as a function of porewater salinity; Integrated sorption and diffusion model

Tachi, Yukio  ; Yotsuji, Kenji

Sorption and diffusion of radionuclides in compacted bentonite are key processes in the safe geological disposal. The effects of porewater salinity on diffusion and sorption of Cs$$^{+}$$, Na$$^{+}$$, I$$^{-}$$ and HTO in compacted montmorillonite were investigated by experimental and modeling approaches. Effective diffusion coefficients (De) and distribution coefficients (Kd) in montmorillonite (dry density of 800 kg/m$$^{3}$$) were measured under different salinities (0.01-0.5 M). The De showed cation excess and anion exclusion effects, which were influenced by salinity. The Kd values for Cs$$^{+}$$ and Na$$^{+}$$ were sensitive to salinity. The Da trends of Cs$$^{+}$$ and Na$$^{+}$$ are mostly independent on salinity. These results were interpreted by the integrated sorption and diffusion (ISD) model coupling the ion exchange model and the EDL diffusion model in narrow pores. This ISD model was further applied to diffusion data of monovalent cations and anions in compacted bentonite, performed well for a wide range of compaction.

Accesses

:

- Accesses

InCites™

:

Percentile:93.63

Category:Geochemistry & Geophysics

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.