向海湿地草根层土壤对铅、镉的静态和动态吸附能力的研究
首发时间:2004-02-11
摘要:本文利用向海湿地采集的草根层土壤进行了吸附Pb2+、Cd2+的静态和动态实验,结果表明草根层土壤吸附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的饱和吸附量的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(Total Organic Carbon,TOC)含量和电导率,对草根层土壤吸附Pb2+、Cd2+的机理进行了探讨,初步推测草根层土壤对Pb2+、Cd2+的吸附属于离子交换吸附。
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Study on the Thermal Adsorption and Dynamic Adsorption Capacities of Pb and Cd onto
Abstract: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 experimental 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 analyzing the pH value, TOC concentration and conductance in the outflow.
Keywords: wetland sod layer soils Pb Cd thermal adsorption dynamic adsorption
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向海湿地草根层土壤对铅、镉的静态和动态吸附能力的研究
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