锇(Ⅳ)-DCS-偶氮胂-溴酸钾催化分光光度法测定微量锇的研究

Study on catalytic spectrophotometric determination of microamounts of osmium by osmium(Ⅳ) DCS arsenazo potassium bromate system

在酸性介质中，微量锇（Ⅳ）的存在对溴酸钾氧化ＤＣＳ－偶氮胂的退色反应有明显的催化作用。研究了退色反应的最佳条件，建立了测定微量锇的催化分光光度新方法，反应在水相中直接进行，测定锇的线性范围在０．０２～０．４５μｇ／１０ｍＬ之间。本法用于贵金属精矿中锇的测定，结果满意。

Microamounts of osmium(Ⅳ) have marked catalytic effect on the oxidative discoloration of DCS arsenazo system by potassium bromate.The optimal conditions were studied,and a new catalytic spectrophotometric method for the determination of mic roamounts of osmium was established.The reaction was carried out directly in aqueous solution, the linear range for osmium is 0.02～0.45μg/10mL.The method has been applied to the determination of osmium in noble metal ores with satisfactory results.