不同pH值、不同比例的添加剂对土壤吸附铯的影响

The Effect of Different pH and Additive on Cs Adsorbed by Soil

铯极易被粘土矿物和有机质吸附而且不易解吸,在示踪水土侵蚀、处置核废物方面有着积极的作用。不同的pH值、不同比例的添加剂都会影响土壤对核素铯的吸附,实验证明两种土壤对核素铯的吸附在pH=4～7时很大,pH=7时达到最大;四种添加剂粗沸石、人造沸石、Ca（OH）2、MnO2只有粗沸石的加入量与铯的吸附比成正相关关系,可以提高土壤对铯的吸附能力。

Cs is easily absorbable while hard for desorption by clunch mineral and organism,so it is very useful in tracking erosion of water and soil and disposal of nuclear waste.The adsorption of Cs depends on different pH and different ratio of additives.Experiments shows that for two sorts of soil,the sorption is strong when pH is from 4～7 and it＇s at maximum when pH is 7;in four sorts of additive,i.e.,thick zeolite,artificial zeolite,Ca（OH）2 and MnO2,only for thick zeolite,the amount added had positive correlation to the adsorption of Cs,by adding which adsorption capability of soil can be improved.