邻羟基苯基重氮氨基偶氮苯光度法测定微量铱  

Determination of Trace Iridium by Spectrophotometric Method with O-hydroxybenzenediazoaminoazobenzene

作　　者：杨运琼[1] 陈文宾[1] 徐国想[1] 朱旭[1] 

机构地区：[1]淮海工学院化学工程系,江苏连云港222005

出　　处：《淮海工学院学报（自然科学版）》2004年第4期48-51,共4页Journal of Huaihai Institute of Technology:Natural Sciences Edition

摘　　要：研究了在十二烷基磺酸钠溶液存在下Ir( )与邻羟基苯基重氮氨基偶氮苯的显色反应,实验结果表明,在pH=10.0的Na2B4O7-NaOH缓冲溶液中,Ir( )与邻羟基苯基重氮氨基偶氮苯形成物质的量之比为1∶2的暗红色配合物,配合物的最大吸收峰位于522nm波长处,表观摩尔吸光系数ε为1.76×105L/(mol·cm)。Ir( )质量浓度在0～18μg/25mL范围内符合比尔定律。运用于催化剂和贵金属矿物中微量铱的测定,获得满意结果。The color reaction of the reagent O-hydroxybenzenediazoaminoazobenzene with Ir(Ⅲ)in the presence of SLS is studied. Results show that the new color reagent reacts with Ir(Ⅲ) to form a stable red complex (1∶2) in the presence of Na_2B_4O_7-NaOH buffer at the pH of 10.0. The maximum absorption wavelength and apparent molar absorptivitity are 522 nm and 1.76×10~5 L/(mol·cm) respectively. Beer's law is obeyed in the range of 0～18 mg/25 mL Ir(Ⅲ). The method has been applied to the determination of trace iridium in catalysts and noble metal minerals with satisfactory results.

关 键 词：邻羟基苯基重氮氨基偶氮苯 分光光度法 铱 

分 类 号：O657.3[理学—分析化学]