痕量镉的水溶性碳纳米管增敏方波溶出伏安法测定  

Determination of Trace Cadmium by Square Wave Stripping Voltammetry Sensitized with Water-soluble Carboxylic Carbon Nanotube

作　　者：杨学娟[1] 狄晓威[1] 姜冉[1] 张军[1] 

机构地区：[1]内蒙古大学化学化工学院,内蒙古呼和浩特010021

出　　处：《分析测试学报》2008年第3期260-262,共3页Journal of Instrumental Analysis

基　　金：内蒙古自治区高等学校科学研究基金资助项目(NJ04096)

摘　　要：研究了以羧基化的水溶性碳纳米管（CNT）作为增敏剂，经吸附富集，用方波溶出伏安法测定痕量镉。讨论了吸附溶出的机理，对富集时间、富集电位、镉浓度、HCl加入量的影响及部分离子干扰等进行实验，并对含镉水样进行测定。实验结果发现：Cd^2＋在-0．65V左右出现灵敏的溶出峰，峰电流在Cd^2＋浓度为2．0-10nmol／L时呈现良好的线性关系，检出限为0.1nmol／L，回收率为94％-103％。Water-soluble carboxylic carbon nanotube was used as a sensitizing agent for the square wave anodic stripping vohammetric measurement of trace cadmium. Possible adsorption and stripping mechanism were discussed. The electrochemical response was characterized with respect to accumulation time, cadmium concentration, supporting electrolyte, influence of hydrochloric acid added and possible interferences. The method was successfully applied to determine trace cadmium in water sample. The results showed that a sensitive stripping peak potential of cadmium is about -0.65 V, and the peak current is linear with the concentration of Cd^2＋ in the range of 2.0-10 nmoL/L. The detection limit is 0.1 nmoL/L, and the recovery is 94%-103% .

关 键 词：羧基化的水溶性碳纳米管 玻碳电极 吸附方波溶出伏安法 镉 

分 类 号：O657.1[理学—分析化学] O614.242[理学—化学]