摘要
本文研究了用2-[2-(3,5-二溴吡啶)偶氮]-5-二甲氨基苯甲酸(简称3,5-diBr-PAMB)分光光度法测定微量铑的反应。实验结果表明,在pH5.0～7.0的酸度范围内,铑与3,5-diBr-PAMB形成1:2的蓝色配合物。试剂的最大吸收峰位于497nm处,配合物的最大吸收峰位于663nm处,表观摩尔吸光系数为1.29×10~5L·mol^(-1)·cm^(-1)。铑含量为0～0.4μg/mL时,遵守比尔定律。所拟方法简便、灵敏,用于催化剂中微量铑的测定,获得满意结果。
A new reagent 2- [2- ( 3,5-dibromopyridyl) azo]- 5-dimethylaminobenzoic acid(3,5-diBr-PAMB)is recommended for determining rhodium. The results show that rhodium and 3, 5- diBr- PAMB form a blue complex at pH5. 0～7. 0. The ratio of Rh to the reagent in the complex is estimated to be 1 : 2. The apparent molar absorptivity of the complex is 1. 29×10~5L. mol^(-1). cm^(-1). Beer's law is obeyed up to 10μg rhodium per 25mL. This method is highly sensitive and selective. It was applied to the determination of rhodium in catalysts with satisfactory results.
出处
《分析试验室》
CAS
CSCD
北大核心
1992年第1期37-39,共3页
Chinese Journal of Analysis Laboratory
关键词
铑
分光光度法
diBr-PAMB
Rhodium determination
Spectrophotometry
2-[-2- ( 3, 5- Dibromopyridyl)azo]- 5- dimethylaminobenzoic acid
