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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。
In acidic medium, the presence of trace osmium (Ⅳ) has obvious catalytic effect on the fading reaction of DCS-arsenazo by potassium bromate. The optimum conditions of fading reaction were studied. A new catalytic spectrophotometric method was established for the determination of trace osmium. The reaction was carried out directly in the aqueous phase. The linear range of osmium was 0.02-0.45μg / 10mL. This method is used for the determination of osmium in precious metal concentrates with satisfactory results.