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本文研究了Co(Ⅱ)在氢氧化钠介质中催化过氧化氢氧化4,5-二溴邻硝基苯基荧光酮(DBON-PF)褪色的新指示反应及影响反应速度的因素,建立了测定痕量钴的催化动力学光度新方法。方法检出限为8.5×10-12g/mL,Co(Ⅱ)含量在0ng/10mL～3.2ng/10mL范围内符合比尔定律,是光度法测定钴的高灵敏体系之一,本法选择性好,灵敏度高,应用于VB12中钴的测定,相对标准偏差为2.8%～3.4%,加标回收率为96%～104%,符合痕量分析的要求。
In this paper, the new indication reaction of Co (Ⅱ) catalyzing the discoloration of 4, 5-dibromo-o-nitrophenylfluorone (DBON-PF) catalyzed by hydrogen peroxide and the factors affecting the reaction rate were studied. A New Catalytic Kinetic Spectrophotometric Method for the Determination of Trace Cobalt. The detection limit of the method is 8.5 × 10-12g / mL and the content of Co (Ⅱ) is within the range of 0ng / 10mL ~ 3.2ng / 10mL. Beer’s law is one of the most sensitive systems for the determination of cobalt by spectrophotometry. , The sensitivity is high, which is applied to the determination of Cobalt in VB12 with the relative standard deviation of 2.8% -3.4% and the recovery of standard addition of 96% -104%, which meets the requirements of trace analysis.