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本文研究了pH＝8．0的氨—氯化铵介质中，Co（Ⅱ）催化溴酸钾氧化茜素红褪色，建立了动力学光度法测定痕量Co（Ⅱ）的新方法．方法检出限为4．4×10-3μg／ml，线性范围0～0．7μg／50ml，实测了天然水中痕量钴，结果满意．
In this paper, Co (Ⅱ) catalyzed the decolorization of alizarin red catalyzed by potassium bromate in ammonia-ammonium chloride solution at pH = 8.0. A new method for the determination of trace Co (Ⅱ) by kinetic spectrophotometry was established. The detection limit of the method was 4.4 × 10-3μg / ml with a linear range of 0 ~ 0.7μg / 50ml. The trace cobalt in natural water was measured and the results were satisfactory.