ABSTRACT

The influence of the ratio between soil weight and solution volume (soil/solution ratio) on a distribution coefficient of cesium for coastal sandy soil, kaoline and silica sand to water has been studied. The distribution coefficients of ¹³⁷Cs for the soils decreased with the increase of the soil/solution ratios. The concentration of the cations dissolved from the soils into the solution varied with the soil/solution ratio. However, when the concentration of coexistent cations kept to be 10^–2 mol/l, the distribution coefficient was kept constant at different soil/solution ratios. These results show that the soil/solution ratio does not directly affect on the adsorption of ¹³⁷Cs on the soils, but the variation in the concentration of dissolved cations with the soil/solution ratio results in the change in the distribution coefficient.