酸雨和有机配体EDTA对稀土在土壤中吸附和解吸的影响  

Effects of Acid Rain on Adsorption an d Desorption of REEs in Red Soil

作　　者：张宇峰[1] 戴乐美[2] 王晓蓉[1] 陈逸君[2] 

机构地区：[1]污染控制与资源化研究国家重点实验室南京大学环境学院,江苏南京210093 [2]南京大学分析中心,江苏南京210093

出　　处：《农业环境保护》2002年第4期293-296,共4页Agro-Environmental Protection

基　　金：国家自然科学基金资助项目(29890280-1)

摘　　要：研究了在模拟酸雨和有机配体EDTA的影响下,红壤对稀土元素Ce、La、Nd、Pr的吸附和解吸。结果表明,稀土元素在红壤中的吸附等温线符合Langmuir等温吸附式。采用酸雨-EDTA溶液作解吸剂时,解吸量随着吸附量的上升而升高。在低吸附量区域,EDTA的络合效应明显;在高吸附量区域,解吸溶液中H+的解吸作用明显。稀土的解吸曲线特征方程随着稀土与EDTA络合条件稳定常数的下降和解吸溶液的pH降低,由二次项函数式向幂函数式转化。Effects of acid rain and EDTAon adso rption and desorption of Rare Earth Elements(REEs )in red soil were investigated.The results showed that the characte ristics of adsorption isotherms corresponded well with the Langmuir equations.When the acid rain and EDTA were used as desorption agen ts,desorption of REEs increased with adsorption of REEs increased.When the formation conditional constants of REEs -EDTA decreased and the pH of desorption ag ent decreased.The characteristics equation of REEs desorption isotherms was from quadr atic function to exponent function.

关 键 词：有机配体 稀土元素 吸附 解吸 乙二胺四乙酸 EDTA 土壤 红壤 

分 类 号：X517[环境科学与工程—环境工程] X53