二溴硝基偶氮氯膦催化动力学光度法测定痕量钴的研究  

The Study on Catalytic Kinetic Spectrophotometry to Determine Trace Cobalt

作　　者：张文德[1] 

机构地区：[1]河北唐山市卫生防疫站

出　　处：《分析试验室》1997年第1期50-52,共3页Chinese Journal of Analysis Laboratory

摘　　要：研究了在ｐＨ７．０磷酸盐介质中，钴（Ⅱ）催化Ｈ２Ｏ２氧化二溴硝基偶氮氯膦（ＤＢＮＣＰＡ）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５×１０－７ｇ／Ｌ，在０．５～３２μｇ／Ｌ范围内，钴（Ⅱ）与ｌｇ（Ａ０／Ａ）呈良好的线性关系。该指示反应灵敏度高，选择性好，用于维生素Ｂ１２和天然水中钴的测定，获得满意结果。The authors studied the discoloring reaction of dibromontrochlorophospho azo(DBNCPA) by hydrogen peroxide oxidation catalyzed by trace Co(Ⅱ) in pH 7.0 phosphate solution.In the range of 0.5 to 32μg/L of Co(Ⅱ),a good linear relation ship existe between the concentration of Co(Ⅱ) and lg( A 0/A ).The limit of detection is 5×10 -10 g/mL.A new method with high sensitivity and selectivity for determining trace Co(Ⅱ) was established.This method was used in the determination of trace Co(Ⅱ) in VB 12 and natural water with satisfactory results.

关 键 词：钴 催化动力学 光度法 二溴硝基 偶氮氯膦 

分 类 号：O614.812[理学—无机化学] O657.3[理学—化学]