^（160）Tb示踪法研究稀土铽在石灰性土壤上的吸着

STUDIES ON THE SORPTION OF RARE EARTH Tb IN CALCAREOUS SOIL USING RADIOTRACESR￣(160)Tb

用放射性示踪剂^（１６０）Ｔｂ和静态平衡法研究铽在石灰性土壤上的吸着，研究了ｐＨ值、ＣａＣｌ_２浓度和温度对吸着的影响，测定了吸附等温线。

The sorption isotherms of rare earth Tb in calcareous soil at various CaCl_2 concentration and temperatures are determined with radiotracer ￣160Tb using batch equilibrium method.The soil sample is collected from the cultivated surface layer(0-20 cm deep)in Yuzhong county(in Gansu province).These isotherms can be described by the Freundlich sorption equation.It is found that the concentration of Tb￣(3+)sorbed in calcareous soil increases with increasing temperatrue and decreasing concentration of CaCl_2.