【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^-5mol/L范围内成正比,检测下限可达1.0×10^-8mol/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=14.8×10⁸。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。更多还原

【Abstract】 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.更多还原