新试剂CPTSQ钴与显色反应研究及应用

STUDY ON THE COLOR BRACTION OF COBALT(Ⅱ)WITH NEW REAGENT CPTSQ AND ITS ANALYTICAL APPLICATION

新试剂ＣＰＴＳＱ钴与显色反应研究及应用殷志禹，徐其亨，曾佐涛（云南大学化学系，昆明，６５００９１）（昆明军事医学院研究所，昆明，６５００００）关键词：８－氨基喹啉衍生物，钴，光度分析以８－氨基喹啉为母体，通过５－位引入羧基苯偶氮以增大试剂的共轭体系及...

In this paper new derivative of 8-aminoquinoline were synthesized。 The color reaction ofcobalt(Ⅱ)with a new reagent,5-(4-carboxylphenylazo)-8-(p-toluenesulfonamido)quinoline (CPTSQ)and its optimum conditions have been investigated.CPTSQ was found tobe a sensitive and better selective reagent for the spectrophotometric determination ofmicroamount cobalt.In the presence of CTMAB,Co(II)reacts with CPTSQ basic mediumto form a violet-blue compex in the ratio of 1:3.Maxium absorbance of the complex is at590 nm with molar absorptivity 1.1×10￣5L/mo· cm. Beer′s law is applicable within therange of 0-11.0μg/25ml for cobalt.The interference of 30 foreign substances was examined.The method has been applied to determine microamount cobalt in component sample andVitamine B_(12)with satisfactory results.