电化学分离富集抑制铜化学发光法测定汞的研究  

Study of the Determination of Mercury Divided and Concentrated with Electrochemistry by Quenching of the Chemiluminescence of Luminol- CN - Cu2+System

作　　者：刘华俊[1] 李玉清[1] 赵燕萍[1] 曾昊[1] 

机构地区：[1]襄樊学院化学化工系,湖北襄樊441053

出　　处：《襄樊学院学报》2002年第2期39-41,共3页Journal of Xiangfan University

基　　金：湖北省高校科研青年发展项目(98B037)

摘　　要：在流通体系中于-0.2V(相对于AgCl/Ag电极)电位下把试样中的汞富集在工作电极上,于+0.35V电位下使富集的汞在Luminol-CN--Cu2+溶液中溶出,溶出的汞使Luminol-CN--Cu2+溶液化学发光强度减弱,化学发光减弱程度与汞浓度成正比,据此测定Hg2+浓度. 本法的选择性较好,检出限为3.3×10-10g/mL,线性范围为1.0×10-7～1.0×10-9g/mL,对1.0×10-7g/mL的汞七次平行测定的相对标准偏差为2.9%,成功地用于雨水和井水中汞的测定.A method is described for the determination of mercury divided and concentrated with electrochemistry by quenching of the Chemiluminescence Signal of luminol—CN -—Cu2+.The method is based on the fact that mercury(Ⅱ) reacts with cyanide to form Hg(CN)42- The method is sensitive and the limit of diction is 3.3×10-10g/mL; the concentration of mercury(Ⅱ) is 1.0×10-7 ～1.0×10-9g/mL. The relative standard deviation for 1.0×10-7g/mL of mercury is 2.9%(n=7). The method has been used for the determination of mercury(Ⅱ) in water with satisfactied result.

关 键 词：化学发光分析 阳极溶出伏安法 流动注射 电化学分离 富集 抑制 测定 

分 类 号：O614.243[理学—无机化学] O657.1[理学—化学]