铋(Ⅲ)-8-羟基喹啉体系络合吸附波及其应用

The Polarographic Adsorptive- Complex Wave of Bismuth-Oxine and Its Application

本文建立了铋(Ⅲ)-8-羟基喹啉体系在单扫示波极谱仪上测定微量铋的方法。以0.6mol/L KOH为支持电解质,该体系有一灵敏导数极谱波,峰电位为-0.68V(vs.SCE)。峰电流与铋的浓度在7.0×10^(-8)3.0×10^(-6)mol/L范围内成线性关系。应用温度系数、电毛细管曲线、循环伏安和脉冲极谱等方法探讨了该极谱波的性质,确认为络合吸附波。应用于测定合金标样获得满意结果。

A sensitive irreversible reduction wave of Bi (Ⅲ)-8-hydroxyguinoline complex was found in the supporting electrolyte containing 0.6mol/L KOH. This reduction wave can be used to determine trace bismuth by single sweep oscillopolarography. The peak potential is -0.60V (vs. SCE). The linear relationship between wave height and concentration of bismuth holds in the range of 7.0×10^(-8)～3.0×10^(-6)mol/L. The characteristics of the polarographic wave was studied by cyclic voltametry, normal pulse polarography and some other methods. The results indicate that the polarographic wave is an adsorptive-complex wave.