<sup>239</sup>Pu在泥岩和砂岩上的吸附分配系数

²³⁹Pu在泥岩和砂岩上的吸附分配系数

摘要: 通过静态批式法研究放射性核素中具有代表性的核素²³⁹Pu在泥岩和砂岩中的吸附情况以及多种影响Pu在泥岩、砂岩中吸附性能的因素。实验测定了泥岩、砂岩中²³⁹Pu的分配系数，考察了岩石粒径、水相pH值、固液比和溶液离子对吸附分配系数的影响。结果表明，Pu在泥岩和砂岩中的分配系数分别为120 mL/g和1.60×10⁴mL/g，砂岩对Pu有较强的吸附性；²³⁹Pu的吸附分配系数随岩石粒径的减小、水相pH的增大、固液比的增大而增大；硝酸溶液体系中，²³⁹Pu在岩石中的吸附性强于模拟地下水体系。

Abstract: 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.