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在酸性介质中，微量钌（Ⅲ）的存在对ＫＩＯ４氧化三溴偶氮氯膦的褪色反应有明显的催化作用。据此褪色反应建立了微量钌的催化分光光度分析法，Ｒｕ（Ⅲ）在０．０２～０．３０μｇ／１０ｍｌ范围内服从比尔定律。反应在水相中进行，应用于贵金属精矿中钌的测定，结果满意。
In acid medium, the presence of trace amount of ruthenium (Ⅲ) has a significant catalytic effect on the fading reaction of tribromo-chlorophosphonated KIO4. According to this fading reaction, a trace of ruthenium was established by catalytic spectrophotometry. The Beer’s law was obeyed in the range of 0.02 ~ 0.30μg / 10ml for Ru (Ⅲ). The reaction was carried out in aqueous phase and was applied to the determination of ruthenium in precious metal concentrates with satisfactory results.