pH值对包气带土壤吸附铅和汞的影响实验  

Experimental research on the pH influence of lead and mercury absorption on the soil in the unsaturated zone

作　　者：赵金艳[1] 王金生[1] 孙福丽[1] 滕彦国[1] 葛晓立[2] 

机构地区：[1]北京师范大学水科学研究院水科学教育部重点实验室,北京100875 [2]国家地质实验测试中心,北京100037

出　　处：《水文地质工程地质》2005年第6期16-19,共4页Hydrogeology & Engineering Geology

基　　金：科技部重点社会公益项目(2001DIA10021)

摘　　要：本文测定了北京西郊4组不同包气带土壤中铅和汞的含量,探讨了pH值变化对铅和汞在土壤样品中分配系数的影响.结果表明:随着pH值的升高,汞和铅在土壤中的分配系数逐步增大,随后降低,pH值与分配系数关系曲线为单峰曲线.汞在砂壤土、轻壤土和中壤土中的分配系数Kd值在0～160mL/g之间,当pH值为10左右时,Kd值最大为160mL/g;铅的分配系数远大于汞,当pH值介于6～10之间时,铅在上述土壤中的Kd值为16 800～29 500mL/g.One of the important factors affecting the value. In this paper the contents of lead and mercury absorption capacity of mercury and lead in soils is the pH in soils at four sites in the west of Beijing were measured, the absorption distribution coefficients （Kd） of lead and mercury in soils affected by pH value were also discussed. The results show that the Kd values of mercury and lead in soils increased first and dropped subsequently as the pH value raised, and the relationship between pH value and Kd values conformed to a single peak curve. The Kd values of mercury in silt loam, light loam and medium loam were between - 20 and 160mL/g, when pH value was about 10, Kd value was 160mL/g; the Kd value of lead was much higher than that of mercury, when pH value was between 6 and 10, the Kd values of lead in the above several type soils were between 16800 and 29 500mL/g.

关 键 词：铅 汞 PH值 分配系数 

分 类 号：P641.3[天文地球—地质矿产勘探] P642.11[天文地球—地质学]