4-(2-噻唑偶氮)-5-二甲氨基苯胺与铑Ⅲ显色反应研究及其应用  

Study on the color reaction of 4-(2-thiazolylazo)-5-dimethylamino-aniline with rhodium Ⅲand its application

作　　者：王贵方[1] 周艳梅[1,2] 王卫民[1] 张光[3] 

机构地区：[1]安阳师范学院化学系,河南安阳455002 [2]河南大学化学化工学院 [3]陕西师范大学化学系,陕西西安710062

出　　处：《冶金分析》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 )

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

关 键 词：催化剂 铑 测定 显色反应 分光光度法 TADMA 显色剂 

分 类 号：O657.3[理学—分析化学]