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本文提出了钴（Ⅱ）催化Ｈ＿２Ｏ＿２氧化茜素红Ｓ褪色反应体系的新催化光度法。本方法灵敏度高，选择性好，精密度高（测２μｇＣｏ（Ⅱ）６次，ＲＳＤ＝１．４３％），适用于水样中痕量钴（Ⅱ）的测定。
In this paper, a new catalytic spectrophotometry was proposed for cobalt (Ⅱ) -catalyzed H 2 O 2 oxidation of alizarin red S fading reaction system. The method has high sensitivity, good selectivity and high precision (measuring 2μgCo (Ⅱ) 6 times, RSD = 1.43%) and is suitable for the determination of trace cobalt (Ⅱ) in water samples.