Distribution Coefficient of Plutonium on Sandstone and Mudstone

The sorption distribution coefficients K_d of plutonium on mudstone and sandstone are studied by batch experiments. The experimental factors influencing K_d are stone granularity, the pH value of the aqueous phase, the solid-to-liquid ratio, different ions existing in aqueous phase. It is shown K_d of Pu on mudstone is about 120 mL/g, K_d of Pu on sandstone is 1.60×10.4 mL/g. The sandstone has greater sorption ability of Pu than mudstone. It is indicated that the K_d of Pu is increasing while granularity of rock minimizing, pH and ratio of solid and liquid increasing; the sorption of Pu on rocks is strongly in aqueous nitrate solution than simulated groundwater.