摘要
研究了显色剂 4 ( 2 噻唑偶氮 ) 5 二甲氨基苯胺 (简称TADMA)与铑 的显色反应。结果表明 ,在 pH3 2～ 4 8范围内 ,铑 与TADMA反应形成 1∶2红色络合物 ,加入无机酸后色泽加深 ,络合物的表观摩尔吸光系数为 1 2 1× 10 5,铑质量浓度在 0～ 0 92 μg/mL范围内服从比尔定律。本方法操作简便 ,灵敏度高 ,选择性好 ,常见金属离子在一定范围内无干扰 ,用于催化剂中微量铑的测定 。
The color reaction between rhodium*# and 4 (2 thiazolylazo) 5 dimethylamino aniline(TADMA) has been studied The experimental results show that Rh*# reacts with TADMA at pH3 2-4 8 to form a red complex which can be changed into another deeply colored stable species by addition of mineral acid Its apparent molar absorptivity is 1 21×10 5L·mol -1 ·cm -1 at 619nm Beer's law is obeyed in the concentration range of 0-0 92μg/mL for Rh*# at 619nm The molar ratio of Rh*# to TADMA is 1∶2 in the complex The method has more sensitivity and selectivity Most common ions don't interfere,it has been applied to the determination of rhodium in catalysts with satisfactory results
出处
《冶金分析》
CAS
CSCD
北大核心
2003年第4期15-17,共3页
Metallurgical Analysis
基金
河南省教育厅资助课题 ( 2 0 0 12 2 5 )
