锶和铯在粉碎花岗岩柱中的迁移研究

MIGRATION STUDIES OF STRONTIUM AND CAESIUM THROUGH CRUSHED GRANITE COLUMN

研究了锶、铯在粉碎花岗岩上的吸附和迁移性能。设计了小型吸附柱,用氚水和^(125)I^-作示踪剂分别测定了自由柱体积FCV,完成了含有小量载体的^(85,89)Sr和^(134)Cs示踪剂淋洗曲线的测定,计算出柱法和批式法的吸附比R_d值,并进行比较。结果表明:所设计的吸附柱能满足碎岩柱实验要求。用氚水或用^(125)I^-测定的FCV本质上没有差別。锶、铯淋洗曲线仅出现单个的宽的淋洗曲线峰,未发现存在不可逆吸附现象。本实验使用的花岗岩对锶的吸附比在较高锶浓度(10^(-3)～10^(-5)mol/l)时随锶浓度而变化。当柱法和批式法两种实验体系中锶量对花岗岩重量比接近时,两种方法测出的R_d值也相近。

In the work, sorption and migration behaviours of Sr and Cs on crushed granite are studied. A small type of sorption column is designed. FCV determination is performed by use of both HTO and ^(125)I^-. Both ^(85,89)Sr and ^(134)Cs which contained a small amount of non-active carriers are used as tracers and elution curves on crushed granite column with Sr and Cs are made. R_d values from column and batch experiment are calculated and compared with each other. Results show that the designed sorption column is satisfactory for crushed rock column experiments. There is essentially no difference in the FCV values obtained with HTO or with ^(125)I^-. Elution curves for Sr and Cs only have a single broad peak of the elution curve, no irreversible sorption phenomenon on the granite is found. The sorption ra-tio for Sr on the granite used in the experiments varies with Sr concentration(10^(-3)～10^(-3)mol/l). The R_d value from column technique is close to that from batch experiment for the similar weight ratio of Sr to granite.