Sorption Modeling Study in the OECD/NEA Sorption Project

Jintoku, Takashi; Shibata, Masahiro ; Yoshida, Yasushi*; Suyama, Tadahiro*

We attended the OECD/NEA Sorption Project in which sorption modeling study and applicability study for other experimental results on minerals was held. In this study, JNC selected the sorption modeling of Ni, Np onto Montmorillonite and U onto Weathered Shist, adopted the surface complexation model and/or ion exchange model, and carried out mainly by using the fitting procedure for the experimental results. In this modeling procedure, PHREEQC geochemical calculation code is used. Based on the analytical results similar to experimental results, the equilibrium constants were fixed.From the applicability study, the trend of the analytical result and experimental one are similar. For the future, validation procedures for this model are needed.