Evaluation of Sorption Distribution Coefficient of Cs onto Granite using Sorption Data Collected in Sorption Database and Sorption Model

摘要

Based on the sorption distribution coefficients (K_d) of Cs onto granite collected from the JAERI Sorption Database (SDB), the parameters for a two-site model without the triple-layer structure were optimized. Comparing the experimentally measured K_d values of Cs onto Mizunami granite carried out by JAEA with the K_d values predicted by the model, the effect of the ionic strength on the K_d values of Cs onto granite was evaluated. It was found that K_d values could be determined using the content of biotite in granite at a sodium concentration ([Na]) of 1 × 10~(-2) to 5 × 10~(-1) mol/dm~3. It was suggested that in high ionic strength solutions, the sorption of Cs onto other minerals such as microcline should also be taken into account.