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在硫酸和热水浴中，Ｏｓ（ Ⅳ） 催化高碘酸钾氧化偶氮胂Ⅲ褪色，建立了测定锇的新催化光度法。锇质量浓度在０ ～０－１０μｇ／２５ｍｌ 范围内符合比尔定律，检出限为９－７ ×１０ － ５μｇ／ｍｌ。对０－０５０μｇ／２５ｍｌ Ｏｓ（ Ⅳ） 测定的相对标准偏差为１－２８ ％ （ｎ ＝ １１） 。催化反应的表观活化能为１０２－２ｋＪ／ｍｏｌ。催化反应对Ｏｓ（ Ⅳ） 和偶氮胂Ⅲ分别为一级反应。试验了４０ 多种共存离子的影响，允许５００ 倍量Ａｇ＋ ，４００ 倍量Ａｕ（ Ⅲ） 和Ｐｔ（ Ⅳ） ，２５ 倍量Ｐｄ（ Ⅱ） 、Ｉｒ（ Ⅳ） 及Ｃｕ２ ＋ 存在。该方法已用于岩矿和冶金产品中锇的测定，相对标准偏差为０－６８ ％ ～３－９２ ％ ，标准加入回收率为９９－８ ％ ～１０３－０ ％ 。
Os (Ⅳ) catalyzed the oxidation of arsenazo Ⅲ by potassium periodate in sulfuric acid and hot water baths. A new catalytic spectrophotometric method was developed for the determination of osmium. Beer’s law was obeyed in the range of 0 ~ 0-10μg / 25ml with the detection limit of 9-7 × 10-5μg / ml. The relative standard deviation for the 0-050 μg / 25 ml Os (IV) assay was 1-28% (n = 11). The apparent activation energy of the catalytic reaction is 102-2kJ / mol. The catalytic reaction of Os (Ⅳ) and arsenazo Ⅲ were first-order reactions, respectively. More than 40 kinds of coexisting ions were tested to allow the presence of 500 times Ag +, 400 times the amount of Au (Ⅲ) and Pt (Ⅳ), 25 times of Pd (Ⅱ), Ir (Ⅳ) and Cu2 +. The method has been applied to the determination of osmium in rock and mine products and metallurgical products. The relative standard deviations are 0-68% ~ 3-92%, and the standard recoveries are 99-8% -103-0%.