显色剂5-(5-碘-2-吡啶偶氮)-2,4-二氨基甲苯测定催化剂中的微量铂  

Specrophotometric determination of platinum (Ⅳ) in the catalysts with chromogenic reagent 5-(5-iodine-2-pyridylazo)-2,4-diaminotoluene

作　　者：杨晓慧[1] 袁棱[1] 尚晓英[2] 任辉辉[1] 杨龙虎[1] 

机构地区：[1]西安文理学院化学与化学工程学院,陕西西安710065 [2]陕西师范大学附属中学,陕西西安710062

出　　处：《工业催化》2012年第6期70-73,共4页Industrial Catalysis

基　　金：西安市科技计划项目(CXY1134WL04);榆林市科技局横向课题

摘　　要：研究了5-(5-碘-2-吡啶偶氮)-2,4-二氨基甲苯(5-I-PADAT)与贵金属铂(Ⅳ)的显色反应,建立了分光光度法测定铂的新方法。结果表明,在pH=5.5的HAc-NaAc缓冲溶液中,铂(Ⅳ)与试剂形成稳定络合物,络合物于3.5 mol.L-1盐酸介质中可转变为另一种具有较高吸收特性络合物,最大吸收波长为595 nm,表观摩尔吸光系数为3.2×104L.(mol.cm)-1。铂含量在(0～1.5)μg.mL-1符合比尔定律。实验建立的分析方法快速,手续简便,选择性较好。The chromogenic reaction of 5- （ 5-iodine-2-pyridylazo ） -2,4-diaminotoluene （ 5-I-PADAT ） with platinum （ IV ） was studied and the spectrophotometrie method for the determination of platinum was established. The experimental results showed that 5-I-PADAT reacted with the platinum （ IV ） to form a stable complex in HAc-NaAc buffer solution （ pH = 5.5 ）. In 3.5mol · L^ - 1HCl solution, the complex was changed into another one which possessed higher absorption characteristics and maximum absorption wave at 595 nm. The apparent molar absorptivity was 3.2 × 10^4 L · （mol · cm） ^-1. Beer＇ s law was obeyed in the platinum range of （0 - 1.5 ） μg · mL· L^- 1. The analytic method was convenient and fast, and also possessed good selectivity.

关 键 词：化学分析 5-(5-碘-2-吡啶偶氮)-2 4-二氨基甲苯 铂 分光光度法 

分 类 号：O657.3[理学—分析化学] O643.36[理学—化学]