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基于氢氧化钠介质中痕量钴对过氧化氢氧化偶氮胭脂红Ｂ的褪色反应的强烈催化作用，建立了催化光度法测定痕量钴的新方法。方法灵敏度为５．２４×１０－１２ｇ／ｍＬ，测定范围为０～３５ｎｇ／１０ｍＬ，对质量浓度为３μｇ／Ｌ的Ｃｏ（Ⅱ）重复测定１１次的相对标准偏差为２．１６％。测得褪色反应的表观活化能为１４５．９０ＫＪ／ｍｏｌ。方法应用于维生素Ｂ１２和矿泉水中痕量钴的测定，结果满意。
A new catalytic spectrophotometric method for the determination of trace cobalt was established based on the strong catalysis of trace cobalt on the fading of azocarmine B by hydrogen peroxide. The sensitivity of the method was 5.24 × 10-12 g / mL with the range of 0 ~ 35 ng / 10 mL. The relative standard deviation (RSD) of 11 replicates of Co (Ⅱ) with a mass concentration of 3 μg / L was 2.16%. The apparent activation energy of the fading reaction was 145.90 KJ / mol. The method was applied to the determination of trace cobalt in vitamin B12 and mineral water with satisfactory results.