不同地区土壤对铜、镉、铅、锌的吸附特性

Adsorption properties of copper,cadmium,lead and zinc in different kinds of region soils

采用振荡平衡法研究了黑龙江双鸭山市、长白山椴树下、陕西兴平、吉林化工学院玉龙山土壤对Cu2+、Pb2+、Cd2+和Zn2+的吸附特性及溶液重金属初始含量对吸附的影响.实验结果表明:土壤对重金属的吸附因土壤性质和重金属特性的不同而不同.4种土壤对Cu2+的吸附符合Freundlich方程,其中黑龙江土壤拟合的相关性最好;4种土壤对Cd2+的吸附等温方程符合Langmuir方程,其中长白山土壤拟合的相关性最好;4种土壤对Pb2+和Zn2+的吸附等温方程拟合的Freundlich方程较Langmuir方程相关性好.

Adsorption Properties of Cu^2＋ , Pb^2＋ , Cd^2＋ , Zn^2＋ in soils, which were from Shuangyashan City in Heilongjiang, tilia in Changbai Mountain, Xingping in Shanxi and Yulong Moutain in Jilin Institute of Chemical Technology, were studied by Oscillation balance method. Meanwhile, initial Contents of heavy metal in solution on the impact of adsorption were also studied. The results showed that the adsorption of heavy metal in soils was different since the metal and soil characteristics were different. Along with the content of Cu^2＋ , Pb^2＋ , Cd^2＋ , Zn^2＋ increasing, adsorption amounts of four kinds of soil to become saturated. Cu^2＋ adsorption isotherms of tested soils followed Freundlich equation,and the relevance of Heilongjiang＇soil was the best; Cd^2＋ adsorption isotherms of tested soils followed Langmuir equation, and the relevance of Changbai Mountain＇ soil was the best. The correlation of Freundlich equation of Pb^2 ＋ and Zn^2＋ adsorption isotherms of tested soils was better than the one of Langmuir equation.