茜素红S-微分吸附计时电位法测定土壤中铝形态  

Speciation Analysis of Aluminum in Soil Samples by Differential Adsorption Chronopotentiometry with Alizarin Red S

作　　者：干宁[1] 李天华[1] 陈妮[1] 童爽[1] 徐伟民[1] 

机构地区：[1]宁波市新型功能材料及其制备科学国家重点实验室宁波大学材料与化工学院

出　　处：《岩矿测试》2007年第3期193-197,共5页Rock and Mineral Analysis

基　　金：国家自然科学基金资助项目(60508012);浙江省科技攻关资助项目(2006C31040)

摘　　要：报道了茜素红S-微分吸附计时电位法分别在酸性和碱性条件下直接检测土壤浸提液中的无机单核铝[Ali]和总单核铝[Ala]浓度,并用该法测定了酸消化浸提液中的总铝[AlT],由[Ala]-[Ali]间接得到有机单核铝[Alo],[AlT]-[Ala]得到酸溶态铝[Alr],从而实现了土壤浸提液中5种铝形态的电化学测定。应用此方法测定了多个实际土壤样品,与标准Driscoll法进行了对照,结果基本一致。Determination of five species of aluminum （total AlT, acid soluble Air, monomeric Ala, inorganic monomeric Ali, organic monomeric Alo） in acid and alkali extraction solutions of soil samples by differential adsorption chronopotentiometry （DACP） with alizarin red S （ARS） is presented in this paper. The method is based on the different competitive complexation capacity of ARS and natural organic matter （NOM） at pH 5.0 and pH 8.5. The method is successfully used to the determination of five Al species in soil samples. The results are in agreement with those obtained from Driscoll＇s speciation method.

关 键 词：茜素红S 微分吸附计时电位法 铝形态 土壤浸提液 

分 类 号：O655.6[理学—分析化学] O658.4[理学—化学]