利用道南膜技术(DMT)研究土壤中重金属自由离子浓度  

Study on free ion concentrations of heavy metals in soils by Donnan Membrane Technique

作　　者：赵磊[1,2] 崔岩山[1,3] 杜心[1] 朱永官[1] 

机构地区：[1]中国科学院生态环境研究中心 [2]云南环境科学研究院,昆明650034 [3]中国科学院研究生院,北京100049

出　　处：《环境科学学报》2005年第11期1565-1569,共5页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.20207012);国家重点基础研究计划项目(No.2002CB410808);中国科学院知识创新项目(No.KZCX1-SW-19)~~

摘　　要：采用近年新发展起来的一种研究重金属自由离子浓度的方法———道南膜技术,研究了采自我国不同地区的11种耕层土壤中Cd、Zn、Pb和Cu的自由离子浓度.结果表明,道南膜技术测定的Cd、Zn自由态浓度与WinHumicV模型计算结果吻合较好,测定的Pb和Cu自由态浓度稍高于WinHumicV模型计算结果.同时,采用Sauv啨提出的吸附腜投匀芙馓妥杂商闹亟鹗艚蟹治?结果表明,溶解态Zn、Cu和Pb以及自由态的Zn、Cu受土壤的污染程度(重金属总量)、土壤pH和溶液中溶解性有机碳控制.Free ion concentration is one of the most important approaches that have been used to determine heavy metal bioavailability in soils. Donnan membrane technique （DMT）, a new method measuring the free metal ion concentrations in soil, was applied to study the free metal ion of some soils collected from different regions of China. The results showed that free Cd^2＋ and Zn^2＋ concentrations corresponded well with those simulated with WinHumicV model. Free Pb^2 ＋ and Cu^2＋ concentrations were higher than those predicted with WinHumicV model. And Sauvé＇s competitive adsorption model, based on soil pH, total metal content and log （DOC）, was a better tool to predict disselved Zn,Cu and Pb as well as free Zn^2＋ and Cu^2＋ concentrations.

关 键 词：道南膜技术 重金属 自由离子浓度 

分 类 号：X131.3[环境科学与工程—环境科学]