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在Ｈ２ＳＯ４ 介质中对碘偶氮氯膦与高碘酸钾的褪色反应只有在痕量钌（Ⅲ）的存在下才能定量进行。本文研究了该褪色反应的最佳条件及用于痕量钌的测定方法， 其检出限为０．０２ μｇ·１０ ｍ Ｌ－ １， 钌含量在０．０２～０．３０ μｇ·１０ ｍ Ｌ－ １范围内符合比尔定律。该方法用于贵金属精矿中钌含量的测定， 获得满意结果。
The fading reaction of iodochlorophosphonazo with potassium periodate in H2SO4 medium is quantitative only in the presence of trace amount of ruthenium (III). In this paper, the best conditions for the fading reaction and the determination of trace ruthenium were studied. The detection limits were 0.02 μg · 10 m L -1 and ruthenium contents were 0.02-0.30 μg · 10 m Beer’s law is in line with L- 1. The method is applied to the determination of ruthenium content in precious metal concentrates and obtains satisfactory results.