镉(Ⅱ)-苯基硫脲络合吸附波的研究及其应用  

Adsorptive Complex Wave of Cadmium(Ⅱ)-Phenylthiourea and Its Application

作　　者：李启隆[1] 李琳[1] 王素芬[2] 张平[2] 

机构地区：[1]北京师范大学化学系,北京100875 [2]北京师范大学环科所

出　　处：《分析化学》1991年第8期864-868,共5页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金;中国科学院长春应用化学研究所电分析化学开放实验室基金

摘　　要：在0.1mol/L KHP(pH=4.0)支持电解质中,镉(Ⅱ)与苯基硫脲形成一灵敏的络合吸附波,峰电位Ep=-0.75V(vs.SCE),峰电流与镉(Ⅱ)浓度在5.0×10^(-8)～1.×10^(-5)mol/L范围内成正比,检测下限可达1.0×10^(-8)mol/L,并用于电镀清水液中微量镉的测定,得到满意的结果。用直线法测得络合物的络合比为C_d(Ⅱ):PTU=1:2,稳定常数β=14.8×10~8。用循环伏安法、线性扫描伏安法等研究了该体系的极谱性质及其反应机理。In 0. 1 mol/L potassium hydrogen phthalate(pH4. 0) supporting electrolytes con taining 5. 0x10^(-4) mol/L phenylthiourea(PTU), a sensitive adsorptive complex wave of Cd(Ⅱ)PTU is obtained by single-sweep polarography. The peak potential of the wave is-0. 75V (vs. SCE). The peak current is directly proportional to the concentration of Cd(Ⅱ) overthe range of 5. Ox10^(-3)～1. 0x10^(-5) mol/L. The detection limit is 1. 0x10^(-8) mol/L. The composition of the complex has been determined to be 1: 2. The method has been applied successfully to the determination of trace cadmium in plating waste water. The mechanism of reaction is discussed.

关 键 词：伏安法 镉 苯基硫脲 络合吸附波 

分 类 号：O614.242[理学—无机化学]