Zeta电位法研究除草剂在土壤胶体中的吸附  

Study on the adsorption of herbicide in soil colloids by Zeta potential measurements

作　　者：杨炜春[1] 刘维屏[1] 胡晓捷[1] 

机构地区：[1]浙江大学环境科学研究所,浙江杭州310028

出　　处：《中国环境科学》2003年第1期51-54,共4页China Environmental Science

基　　金：国家自然科学基金资助项目(39670420)

摘　　要：应用Zeta(z )电位法研究比较了扑草净和扑灭通在4种土壤胶体中的吸附.结果表明,当带有正电荷的除草剂在负电荷土壤表面吸附后,土壤表面的z 电位有所增加,甚至使z 电位从负转变成正.通过零电荷点计算得到除草剂和土壤之间的吸附常数和Gibbs自由能,并由经典的振荡平衡法得到相近结果.The adsorption of prometryne and prometon on 4 kinds of soil colloids was studied and compared using z electric potential technique. The results showed that the z electric potentials of soil surface raised somewhat as the positively charged herbicides were adsorpted on the soil surface charged negatively. The herbicides affect the z electric potential even causing its change from negative to positive. Through calculating the point of zero charge, Gibbs energies and adsorption constants between the herbicide and soil was obtained, and the results were similar to those calculated with batch oscillation equilibration technique.

关 键 词：扑草净 扑灭通 土壤胶体 吸附 ζ电位法 除草剂 

分 类 号：X53[环境科学与工程—环境工程] X592