铀在土壤中的吸附动力学

研究了铀在某放射性废物处置预选场址土壤中的吸附性能.用动态法测定了铀在该土壤中的平衡吸附量,研究了水相pH值、流量、土壤粒度和铀溶液的初始质量浓度对土壤吸附铀的影响:水相pH值接近中性时,平衡吸附量较大;流量为60 mL/h时的平衡吸附量比90和120mL/h时大;土壤粒度小的平衡吸附量较大;铀溶液的初始质量浓度越大,平衡吸附量越大.用常用的吸附动力学方程对实验数据进行了拟合,其中E lovich方程的拟合度最好.实验结果表明,该放射性废物处置预选场址土壤对铀的最大吸附率为54.75%,吸附性能较差.

Adsorption Kinetics of Uranium in Soil

Adsorption properties of uranium in the soil of a nuclear waste repository are investigated by dynamic method.The effects of pH values,flux,granularities of the soil and initial mass concentration of uranium solution on the absorption properties are studied.The equilibrium adsorptive quantities are 2.81,10.84,15.95,5.45 mg/g when pH values are 3,5,7,9 respectively.The equilibrium adsorptive quantity is larger when soil grain size is smaller and flux is 60 mL/h,and the higher of the initial concentration of uranium solution is,the larger of the equilibrium adsorptive quantity is.Experiment data were fitted with the typic equations of absorption kinetics,in which Elovich equation is best fitted.The experiment results show that the maximal adsorption rate of uranium in the soil of the primary election nuclear waste disposal field is 54.75%,but adsorption properties are not so good.