镉-茜素紫-邻二氮菲体系的极谱行为及应用

Polarographic Adsorptive Wave of Cadmium (Ⅱ)-Alizarin Violet - o - Phenanthroline System

用线性扫描示波极谱法研究了镉（Ⅱ）－茜素紫－邻二氮菲体系的极谱行为，发现在含有０．１ｍｏｌ／Ｌ ＫＣＩ、ｐＨ＝２．８５的 ＨＡｃ溶液中，镉（Ⅱ）－茜素紫－邻二氮菲体系产生一灵敏的极谱吸附波，其峰电位为－ ０．６４ Ｖ（ｖｓ． ＳＣＥ），峰电流与镉（Ⅱ）的浓度在 ５．０ × １０－８～ １．０ × １０－６ ｍｏｌ／Ｌ的范围内呈线性关系；检出限为 ３．０ × １０－８ｍｏｌ／Ｌ。研究了电极反应机理，并用建立的方法成功地测定了废水样中的镉。

A sensitive derivative adsorptive wave of Cd(Ⅱ)-alizarin violet o-phenanthroline (Phen) system was obtained by using linear sweep polarography in HAc solution (pH = 2. 85) containing 0. 1mol/L KCI, 0.0010% alizarin violet in alcohol and 0.0014% phen. The peak potential is - 0.64V (vs. SCE). The peak height with concentration relationship is linear from 5. 0 x 10-8 - 1. 0 x 10-6 mol/L. The detection limit is 3 .0 x 10-8 mol/L. The method has been applied to the determination of Cd(Ⅱ) in waste water samples with satisfactory results.