对碘偶氮氯膦用于微量铂系元素测定的应用研究

Determination of Platinum Group Metals with Chlorophosphonazo-pI

根据对碘偶氮氯膦在微量铂系元素Ru、Rh、Os、Ir、Pt等离子的存在下与氧化剂KIO4(KBrO3)之间的褪色反应建立了这5种铂系元素的催化光度分析新方法;而对碘偶氮氯膦在硝酸介质中能与钯形成稳定的蓝色络合物又建立了分光光度法测定微量钯的新方法。作者研究了此系列反应的最佳条件及用于各种铂系元素测定的方法和应用。

In this paper, five catalytic spectrophotometric methods based on the catalytic effect of platinum group metals on the oxidations of chlorophosphonazo-pI with KIO4（KBrO3） in acidic medium were proposed for the determination of trace Ru, Rh, Os, Ir and Pt. At the same time, the colouration reaction between palladium and chlorophosphonazo-pI was studied, too. It was found that palladium reacts with chlorophosphonazo-pI to form a 1：1 blue complex in H2SO4 medium. The methods proposed in this paper have been applied to the determination of platinum group metals in ores and catalysts with satisfactory results.