Ir(Ⅲ) 偶氮氯膦 PN KIO_4催化分光光度法测定微量铱

Catalytic Spectrophotometric Determination of Ir(Ⅲ) by Decolorizing Reation with Ir(Ⅲ)-KIO_4-Chlorophosphonazo-PN

在 0 .5mol·L- 1H2 SO4 介质中 ,微量铱的存在对KIO4 偶氮氯膦 PN的褪色反应有明显的催化作用 .本文研究了该褪色反应的最佳条件及用于微量铱的测定方法 .检出限为 0 .1 μg·mL- 1,铱含量在 0 .2～ 1 .6 μg·mL-

A sepctrophotometric method for the determination of Ir(Ⅲ) has been established on the catalytic action of Ir(Ⅲ) on the oxidative fading Chlorophosphonazo -PN with KIO 4 in acid medium .The method offers the advantages of simplicity ,rapidity and sensitivity.Beer's law is obeyed from 0.2 ～1.6 μg ·mL -1 and the determination limit is 0.1μg·mL -1.