新体系Co－H_2O_2－OCPF催化褪色光度法测定痕量钴的研究  

The Studies on a New System of Catalytic Spec-trophotometry to Determine Trace Cobalt

作　　者：方国春[1] 王洪祥[1] 李广祖[1] 王敏[1] 

机构地区：[1]武汉大学化学系

出　　处：《分析试验室》1994年第4期41-43,共3页Chinese Journal of Analysis Laboratory

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。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( A_0/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 VB_(12) and filth waterwith satisfactory results.

关 键 词：钴 过氧化氢 荧光酮 OCPF 比色法 

分 类 号：O614.812[理学—无机化学]