2－胂酸基－4－甲基苯基重氮氨基偶氮苯与镍的显色反应研究及应用  

Color Reaction of 2-Arsono-4-methylphenyl diazoaminoazobenzene with Nickel and Its Anal ytical Appl ication

作　　者：孙培培[1] 吴斌才[1] 刘恒椽[1] 

机构地区：[1]华东师范大学化学系

出　　处：《岩矿测试》1994年第1期33-35,40,共4页Rock and Mineral Analysis

摘　　要：作者将新合成的显色剂２－胂酸基－４－甲基苯基重氮氨基偶氮苯用于Ｎｉ的分光光度分析。在ｐＨ１１．２的Ｎａ＿２Ｂ＿４Ｏ＿７－ＮａＯＨ缓冲介质中，非离子型表面活性剂ＯＰ存在下，试剂与Ｎｉ（Ⅱ）生成组成为２：１的稳定红色配合物，其最大吸收波长位于５３８ｎｍ，表现摩尔吸光系数ε＿５３８＝１．９２×１０￣５Ｌ·ｍｏｌ￣－１·ｃｍ￣－１，Ｎｉ量在０～０．３２μｇ／ｍｌ范围符合比尔定律。用该法测定了铝合金及硫化镍矿石中的微量Ｎｉ，结果与推荐值相符，ＲＳＤ（ｎ＝５）小于５％。sensitive color reaction of Ni(Ⅱ)with a new reagent 2-arsono-4-methylphenyl-diazoaminoazobenzene has been studied.Astable red complex is formed in a medium of pH 10.8～11.5 and in the presence of OP. The ratio of Ni(Ⅱ)to the reagent in the complex is found tobe 1 :2.The apparent molar absorptivity measured is 1.92×10￣5L·mol￣-1· Cm￣-l at 538 nm.Beer’s law is obeyed in the range of 0～0.32μg/ml.The method has been applied to thedetermination of Ni in aluminium allovs and Ores with satisfactory results.

关 键 词：镍 显色反应 氨基偶氮苯 比色法 

分 类 号：O614.813[理学—无机化学]