不对称变色酸双偶氮试剂-铂系元素-氧化剂三元体系光度分析的研究及应用

Study on Fading Reaction of Ternary System Asymmetric Bis (arylazo) Chromotropic Acid Reagent-Platinum Metal-Oxidant and Its Application

报告了３组（胂类、膦类和羧酸类）共８种不对称变色酸双偶氮试剂与某些氧化剂（ＫＩＯ４、ＫＢｒＯ３）之间的褪色反应对于痕量铂系元素的依赖关系。考察了１８个褪色反应的最佳条件、检出限及线性关系范围。提出了一系列光度法测定痕量钌、铑、锇、铱、铂的新方法。此类方法可直接在水溶液中进行、简便快捷，且灵敏度极高。已用于贵金属精矿、催化剂等样品中铂系元素含量的测定。

The fading reactions between eight kinds of asymmetric bis(arylazo)chromotropic acid reagents(containing phosphono arsenazo and carboxyazo)and oxidant is studied.It is found out that this reaction is catalyzed by trace platinum metals A series of catalytic spectrophotometric methods for determining trace platinum metals are established.In the same time,optimum conditions of reactions,detection limit and linear range of methods are also investigated.These methods posses advantages of simplicity,rapidity and high sensitivity.It is applied to the determination of platinum metals more and catalyst with satisfactory results.