新疆棕漠土无机胶体对Pb^(2+)的吸附特征研究  

Study on Absorption of Pb^(2+) by Inorganic Colloid of Brown Desert Soil in Xinjiang

作　　者：孙红专[1,2] 杨剑虹[3] 

机构地区：[1]新疆塔里木大学生物技术研究与开发中心,新疆阿拉尔843300 [2]塔里木盆地生物资源保护与利用重点实验室,新疆阿拉尔843300 [3]西南大学资源环境学院,重庆北碚417706

出　　处：《土壤通报》2009年第6期1284-1287,共4页Chinese Journal of Soil Science

摘　　要：本文选用采自新疆阿克苏地区典型的棕漠土壤,用模拟吸附方法研究棕漠土无机胶体在不同阴阳离子作用下对Pb2+的吸附特征,得出:棕漠土无机胶体对铅的等温吸附曲线可以用Langmuir等温方程式很好的拟合,解吸后,铅在胶体内的残余量与加入溶液的浓度呈很好的一次函数关系;随着加入支持电解质浓度的增加,胶体对铅的吸附量逐渐减少;阳离子对土壤无机胶体吸附铅的影响为:K+>NH4+>Na+;阴离子对铅吸附影响为Cl->NO3-。This paper chose the typical brown desert soil from Aksu, Xinjiang, and studied the absorption of Pb^2＋ by inorganic colloid. The results were as follows： Isothermal adsorption curve of Pb^2＋ absorbed by inorganic colloid of brown desert soil could match with Langmuir equation well. After desorption, the relationship between original Pb^2＋ concentration and remainder Pb^2＋ content in colloid was a linear function. With the increase of electrolyte strength, the absorption quantity of Pb^2＋ by colloid decreased gradually. The influence on competitive adsorption of lead decreased in the order of K^＋, NH4^＋ and Na^＋, and the influence of Cl- on lead absorbed by soil colloid outweighed that of NO3^-.

关 键 词：棕漠土 无机胶体 Pb^2+吸附 支持电解质浓度 

分 类 号：S275.6[农业科学—农业水土工程]