铅在土壤及其组分中吸附行为研究

本文研究铅在土壤及其组分中的吸附，并用Freundlich等温吸附方程对实验结果进行拟合。结果显示土壤中各项组分对铅吸附能力的大小为：土壤胡敏酸〉土壤〉土壤矿物质；铅在土壤中的吸附满足线性吸附，铅在土壤胡敏酸和土壤矿物质中的吸附不属于线性吸附；pH值是影响土壤吸附铅的主要因素，随着溶液pH值的升高，土壤对铅的吸附能力增加，当pH值达到一定程度时，土壤对铅的吸附能力增加缓慢。

Adsorption Behavior of Soil and Its Composing Component to Lead

Adsorption experiments of lead in soil and its components were conducted, and its results were fitted with Freundlich isothermal adsorption equation. The results show that the lead absorption ability of respective soil components is following the order of soil humic acid 〉 soil 〉 soil mineral. The lead adsorption in soil meets the condition of linear adsorption, while the lead adsorption in oil humic acid and soil mineral is non-linear adsorption, pH value is the main factor that influences the lead adsorption in soil. The lead adsorption ability in soil improves while pH value in solution increases. When pH value reaches a certain number, the lead adsorption ability in soii will increase slowly.