铟(Ⅲ)-向红菲啰啉络合物极谱吸附波的研究

Polarograhic Adsorptive Wave of Indium-4,7-diphenyI-l,10-phenanthroline Complex

在pH=3.8的磷酸柠檬酸盐缓冲体系中,铟(Ⅲ)-向红菲(口罗)啉络合物在单扫描示波极谱仪上于-0.67 V(vs.SCE)处产生一灵敏的吸附还原波,其二阶导数波灵敏度高,波形好.峰电位Ⅰ~O_P与钢(Ⅲ)浓度在 2.0X10^(-8)~2.0X10^(-6)mol/L范围内呈良好的线性关系,其检测限为8X10^(-9)mol/L铟(Ⅲ).该法用于试剂氧化锌和镀膜玻璃中铟(Ⅲ)的恻定,结果较好.

In a supporting electrolyte containing 2. 5 × 10-3 mol/L Na2HPO4-7. 5 × 10-3 mol/L citric acid at pH = 3. 8, a sensitive adsorptive wave of indium-4, 7-diphenyl-1, 10 phenanthroline(BPT) complex was studied by single sweep polarography. The peak potential is -0. 67 V(vs. SCE). The linear relationship between the peak current and the indium concentration is in the range of 2×10-8-2×10-6 mol/L, the detection limit is 8×10-9mol/ L. The method has been applied to the determination of indium in zinc oxide and plating membrane With satisfactory results.