二溴对甲偶氮羧与钯(Ⅱ)的显色反应及用于微量钯的分光光度测定

Study on the color reaction of palladium with dibromo-p -methylcarboxylazo and its application

研究了新试剂二溴对甲偶氮羧与钯 ( )显色反应的最佳条件及其应用 ,建立了一种在水相中直接测定微量钯的高选择性分光光度分析方法。其表观摩尔吸光系数 ε6 2 3=2 .1 3× 1 0 4L· mol- 1 · cm- 1 ,钯含量在 0 .2～ 1 .2 μg·m L- 1 范围内符合朗伯

In this paper,the color reaction of dibromo p methylcarboxylazo with palladium was studied.It was shown that a stable blue complex was formed in acid medium.Its molar absorptivity is 2.13×10 4L·mol -1 ·cm -1 at 623nm.Beer′s law is obeyed in the range of 0 20~1 20μg/mL.This method has the advantages of high sensitivity and selectivity.It was successfully applied to the determination of trace amounts of palladium in anode mud with satisfactory results.