铑(Ⅲ)-KIO_4-对乙酰基偶氮羧催化分光光度法测定微量铑

Catalytic spectrophotmetric determination of rhodium by rhodium(Ⅲ)-KIO_4-p-acetylcarboxylazo system

在酸性介质中铑(Ⅲ)对KIO4氧化对乙酰基偶氮羧的褪色反应有明显的催化作用,据此,确定了最佳反应条件,建立了测定微量铑的催化光度分析法。铑在5 0～100μg/L范围内符合比尔定律,反应在水相中进行,用于铂-铑催化剂中铑的含量测定,结果满意。

A new catalytic spectrophotometric method for the determination of rhodium has been established based on the catalytic action of Rh(Ⅲ) on the oxidative fading reaction between pacetylcarboxylazo and KIO4 in acid mediumThe method offers the advantages of simplicity,rapidity and sensitivityBeer's law is obeyed in the range of 50-1000μg/LThe method bas been applied to the determination of rhodium in platinum-rhodium catalyst with satisfactory results