摘要
在PH6，34的柠檬酸三钠-盐酸介质中，铜（Ⅱ）与7－碘－8－羟基喹啉－5－磺酸（Fer－ron）形成络合物，在线性单扫描示波极谱仪上产生一灵敏吸附波，一阶导数峰电位Ep=0．56V（vs．SCE）。峰电流与铜的浓度在0．005～0．315μg／mL间呈良好的线性关系，检出限为0．001μg／mL。用多种电化学方法研究了极谱波的性质及电极反应机理，证明了该极谱波为络合物吸附波，峰电流由中心离子铜（Ⅱ）还原产生，络合物组成为Cu（Ⅱ）：Ferron=1：1，表现稳定常数β=1．52×104。试验了多种离子对峰电流的影响。方法应用于生铁和硅钢标样中铜的测定，获得满意结果。
In the medium of trisodium citrate-HC1,Cu (Ⅱ)reacts with 7-iodo-8-hydroxyquinoline-5-sulphonic acid (Ferron)to form a complex,which has a sharp ploargraphic wave at-0. 56v(vs. SCE). The peak height is linear with the concentration of Cu(Ⅱ)in the range of0. 005ug/mL-0. 315 ug/mL,the detection limit is 0. 001ug/mL. Several electrochemical methods are used to investigate the electrode reaction mechanism and proved as following: Ploargraphic wave is an absorptive wave;the composition of the complex is 1: 1,the number of electron transfer is 2 ; the apparent stability constant is found to be β= 1. 52 × 104; the peak current is produced by the reduction of central ion Cu(Ⅱ). The method is successfully applied to the determination of Copper(Ⅱ)in standard sample.
出处
《四川轻化工学院学报》
1998年第3期53-57,共5页
Journal of Sichuan Institute of Light Industry and Chemical Technology
关键词
铜
络合物
吸附波
碘
羟基喹啉
磺酸
电化学分析
Copper (Ⅱ)
absorptive of complex
7-iodo-8-hydroxyquinoline-5-sulphonic acid
