向海湿地土壤草根层对铅镉的静态和动态吸附能力的研究  

Study on the thermal adsorption and dynamic adsorption capacities of Pb and Cd onto the soils sampled from the sod layers in Xianghai wetland

作　　者：李鱼[1] 王月[1] 王晓丽[1] 刘亮[1] 李云鹏 李青山[3] 

机构地区：[1]吉林大学环境与资源学院,吉林长春130023 [2]辽宁省水文水资源勘察局,辽宁沈阳110007 [3]松辽流域水资源保护局,吉林长春130021

出　　处：《东北师大学报（自然科学版）》2004年第3期95-100,共6页Journal of Northeast Normal University(Natural Science Edition)

基　　金：国家自然基金重点项目(50139020)

摘　　要：　对向海湿地采集的土壤草根层进行了吸附Pb2+,Cd2+的静态和动态实验,结果表明土壤草根层吸附Pb2+,Cd2+的过程符合Langmuir和Freundlich等温吸附曲线(n=8,P=0.02),动态实验的饱和吸附量约是静态实验饱和吸附量的6倍,且吸附Pb2+的能力大于吸附Cd2+的能力.通过分析动态实验流出液的pH值、有机质含量和电导率,对土壤草根层吸附Pb2+,Cd2+的机理进行了探讨,初步推测土壤草根层对Pb2+,Cd2+的吸附属于离子交换吸附.In this paper,the thermal adsorption and dynamic adsorption of Pb and Cd to the soils sampled from the sod layer in Xianghai wetland were investigated.The results show that the thermal adsorption of Pb and Cd onto sod layer soils could be described using Langmuir and Fruendlich isotherms with the correlation coefficient significant at the confidence level of P=0.02(n=8),the saturation adsorption of dynamic adsorption is 6 times greater than that of the thermal adsorption,and the maximum adsorption of Pb is 6 times greater than that of Cd.It is estimated that the dynamic adsorption mechanism of Pb and Cd to the soils sampled from the sod layer in Xianghai wetland is the kind of ion exchange by an alyzing the pH value, TOC concentration and conductance in the outflow.

关 键 词：湿地 土壤草根层 铅 镉 静态吸附 动态吸附 

分 类 号：X131.3[环境科学与工程—环境科学]