【摘要】 本文研究了在碱性介质中，钴（Ⅱ）对过氧化氢氧化邻氯苯基荧光酮（ＯＣＰＦ）褪色反应，建立了催化光度法测定痕量钴的新方法。其检出限为８．２ｐｇ／ｍＬ，在０～３．５ｎｇ／ｍＬ范围内，钴（Ⅱ）与ｌｏｇ（Ａ＿０／Ａ）有良好线性关系。该指示反应灵敏度高选择性好，应用于维生素Ｂ＿（１２）和污水中钴的测定获得满意结果。更多还原

【Abstract】 Inabasic medium,traceCo（Ⅱ）can catalyze thediscolouring oxidization of o-chlorophenylfluorone（OCPF）by hydrogen peroxide.In the range of 0 to3.5ng/mL of Co（Ⅱ）,a good linear relation exists be-tween the concentration of Co（Ⅱ）and lg（ A₀/A）.The limit of detection is 8.2× 10￣（-12）g/mL. Vitamin Cis used to stop the action,thus a new method to deter-mine trace Co（Ⅱ）by spectrophotometry is estab-lished. The interference of more than 20 common ionshas been examined.This method was used in the de-termination of trace Co（Ⅱ）in VB₁₂ and filth waterwith satisfactory results.更多还原