2025 Volume 32 Issue 2 Pages 40-58
Approximate analytic equation of the surface complexation based on Basic Stern Model was derived and a simple procedure to estimate of the sorption distribution coefficient Kd was presented. The Kd values of Cs, I, and Pu on sandstone were evaluated and compared to the data in the sorption data base compiled by JAEA. The calculated values are almost equal to those given by the geochemical speciation code MICROQL II and acceptable accordance with experimental data were found. Sensitivity analysis and uncertainty analysis were also conducted by using the presented procedure for the case in which the minimum and maximum Kd values differed by a factor of 7 even though the experimental conditions were almost the same. The result revealed that the variation of the logarithm of the intrinsic surface complexation constant within 10% gave rise the possible scatter of several fold in Kd.
