铑(Ⅲ)-溴酸钾偶氮胂Ⅲ褪色光度法测定微量铑的研究

A Study on Discoloring Spectrophotomeric Deterination of Rhodium(Ⅲ) by Rhodium(Ⅲ)-Potassium Bromate-2,7-double-1,8-dinyaroxy-3,6-uaphthalene Dieulfonie Acid System

报道了以铑(Ⅲ)催化溴酸钾氧化偶氮胂Ⅲ的褪色反应,建立了水相中直接测定微量铑的催化光度分析法.铑含量在1.0～30.0μg·L-1范围内符合比耳定律,测定限1.0μg·L-1.用于铂 铑催化剂的测定,结果满意.

A new discoloring spectrophotometric method for the determination of rhodium(Ⅲ) has been established,based on its catalytic effect on the oxidation of 2,7-double-1,8-dinyaroxy-3,6-naphthalene dieulfonie acid with KBrO_3 in acid medium.Beer's law is obeyed in the concentration range of 1.0～30.0μg·L^(-1).The limit is of detection is 1.0μg·L^(-1).The method has been applied to the determination of trace amount of rhodium in Platinum-Yhodium Catalyst with satisfactory results.