钴与5－Cl－PADAB反应机理及其应用的研究  

Reaction Mechainsm of Cobalt with 4-5-Choro-2-Pyridylazo)-1,3- Dialninobenzene Complex and itsApplication

作　　者：汤桂娜[1] 袁继红[1] 王保宁[1] 

机构地区：[1]中国科学院长春应用化学研究所

出　　处：《分析试验室》1994年第3期21-23,共3页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金

摘　　要：对钴与４－［（５－氯－２－吡啶）偶氮］－１，３－二氨基苯（５－Ｃｌ－ＰＡＤＡＢ）形成络合物的吸收光谱进行探讨，结果表明：试剂及络合物在不同酸度条件下形成不同型体。在酸性条件下，络合物为大阳离子，钴离子以三价形式存在，钻与试剂的络合比为１：２。在强酸性介质中，将此络合物用于光度测定钻，方法选择性及稳定性好，且灵敏度极高。对水、粮食、土壤、茶叶及维生素Ｂ＿（１２）中微量钻进行直接测定，获得满意结果。The dissociation equilibrium of 4-(5-chloro- 2-pyridylazo)-1,3-diaminobenzene(5-Cl-PADAB andthe reaction mechanism with cobalt were studied byspectrophotometry. The resuLts showed that Co(Ⅲ)and the reagent form a cation complex with the ratioof 1: 2.Two absorbing species existing in acidic solu-tion were determined by using principal componentanalysis to th6data set of absorbances measured atdifferent pH and the reaction mechanism was suggest-ed. The reaction was investigated for applying to thedirect spectrophotometric determination of cobalt invarious materials such as environmental samples,food and vitamin B_(12) etc. without separation。

关 键 词：钴 络合物 Cl-PADAB 测定 水 面粉 

分 类 号：O614.812[理学—无机化学]