铑(Ⅲ)-溴酸钾-二溴邻硝基偶氮胂催化分光光度法测定微量铑

Discoloring Spectrophotomeric Determination of Rhodium(Ⅲ) by Rhodium(Ⅲ)-Potassium Bromate-Dibromo-o-nitro-Arsenazo

以铑(Ⅲ)催化溴酸钾氧化二溴邻硝基偶氮胂的褪色反应,建立了一种在水相中直接测定微量铑的催化光度分析法.铑含量在0.0-20.0μg.L-1范围内符合比耳定律.用于铂-铑催化剂中铑的测定,结果令人满意.

A new discoloring spectrophotometric method for the determination of rhodium（Ⅲ） is estab- lished based on its catalytic effect on the oxidation of dibromo-o-nitro-Arsenazo in acid medium. Beer＇ s law is obyed in the concentration range of 0. 0-- 20. 0μg · L^-1 The method has been applied to the determination of trace amount of rhodium（ Ⅲ ） in platinum-rhodium catalyst, the results are satisfacto- ry.