铑(Ⅲ)-溴酸钾-二溴对甲偶氮羧催化分光光度法测定痕量铑  

Spectrophotometric Determination of Trace Rh in Rh(Ⅲ)-Dibromo-p-Methylcarboxylazo-KBrO_3

作　　者：刘锡林[1] 郭德馨 李琼[1] 

机构地区：[1]甘肃联合大学理工学院,甘肃兰州730000 [2]甘肃省西和县石堡中学,甘肃兰州742100

出　　处：《甘肃联合大学学报（自然科学版）》2005年第2期43-44,共2页Journal of Gansu Lianhe University :Natural Sciences

摘　　要：在酸性介质中,痕量Rh(Ⅲ)的存在对KBrO3 氧化二溴对甲偶氮羧的褪色反应有明显的催化作用.据此褪色反应建立了测定痕量铑的动力学催化光度分析方法.铑检出限为 0.001μg·mL-1,在 0.002~0.050μg·mL-1范围内符合比耳定律.反应在水相中进行,重现性好,用于铂 铑催化剂中铑的测定,结果满意.A new catalytic spectrphotometric method for the determination of Rhodium(Ⅲ) has been established on the catalytic action of Rh(Ⅲ) on the oxidative fading chlorophosphonazo with KBrO_3 in acid medium.The method offers the advantages of simplicity,rapidity and sensitivity.Beer’s law is obeyed from 0.002 to 0.050μg·mL^(-1) and the determination limit is 0.001μg·mL^(-1).The catalytic reaction occurs in water phase.This method has been used to determine Rh in platinum-rhodium catalyst with satisfactory results.

关 键 词：铑 二溴对甲偶氮羧 催化分光光度分析 

分 类 号：O657.32[理学—分析化学]