阳极溶出伏安法测自来水中痕量砷离子的研究  

Determination of Trace Arsenic in Tap Water by Anodic Stripping Voltammetry

作　　者：方怀防[1] 王莎[1] Fang Huaifang Wang Sha(Key Laboratory of Analytical Chemistry o the State Ethnic Affairs Commission,College of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074,Chin)

机构地区：[1]中南民族大学化学与材料科学学院,分析化学国家民委重点实验室,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2017年第1期13-16,60,共5页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金资助项目(21275165);中南民族大学人才引进资助项目(YCZY12020)

摘　　要：为采用阳极溶出伏安法(ASV)测定不同形态的砷(As),优化了pH值、沉积电位、沉积时间和支持电解质等影响因素.结果表明:该体系在1~100μg/L峰电流与As(Ⅲ)的浓度呈现良好的线性关系,相关系数为0.998,检出限为37.5 ng/L,8次重复测定10μg/L As(Ⅲ)RSD为1.27%.该方法可通过还原As(V)为更有电活性的As(Ⅲ)来实现As(V)的测定,可用于检测自来水样品中超痕量As(Ⅲ)和As(V),测定结果与电感耦合等离子质谱结果相一致,实现了不同形态砷的测定.gTo determine different forms of arsenic by anodic stripping voltammetry（ASV）,factors including pH,deposition potential,deposition time,and supporting electrolyte were optimized. The results showed that the optimized system provided a linear calibration in the range of 1 to 100 μg/L,with a respective correlation coefficient of 0. 998,and a detection limit of 37. 5 ng/L. The RSD was 1. 27% for 10 μg/L of As（Ⅲ） with eight repetitive measurements. The method could be used to determine As（V） by chemical reduction of As（V） to more electroactive As（Ⅲ） and to detect ultra-trace As（Ⅲ） and As（V） in tap water. The results agreed well with that of ICP-MS and was also capable of determining different forms of arsenic.

关 键 词：砷 阳极溶出伏安法 形态分析 自来水 

分 类 号：O675.1[理学—化学] O613.63