镍与邻羧基苯基重氮氨基偶氮苯的显色反应及其应用  

Chromogenic Reaction of Nickel with o-Carboxybenzenediazoaminoazobenzene and Its Application

作　　者：郭忠先[1] 陶玉国[1] 张淑云[1] 

机构地区：[1]四川轻化工学院化学工程系

出　　处：《岩矿测试》1995年第3期205-207,共3页Rock and Mineral Analysis

基　　金：四川省教委科研基金

摘　　要：在乳化剂ＯＰ存在下，于ｐＨ９．７～１０．０的Ｎａ＿２Ｂ＿４Ｏ＿７－ＮａＯＨ缓冲介质中，Ｎｉ￣（２＋）与邻羧基苯基重氮氨基偶氮苯（ＣＤＡＡ）形成组成比为１：２的稳定的红色配合物，其吸收峰波长在５４０ｎｍ，对比度△λ＝１２６ｎｍ，表观摩尔吸光系数为１．９９×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），室温下２０ｍｉｎ内显色反应完全，有色配合物至少稳定１２ｈ。方法线性范围是０～０．２０μｇ／ｍｌＮｉ，检测限为０．０００４μｇ／ｍｌ。在掩蔽剂存在下，方法用于矿样和低合金钢的分析，结果与标准值相符，其ＲＳＤ（ｎ＝６）分别为１．８％和３．１％，标准加入回收率为９５．０％～１０１．２％。ickel forms a red 1 :2 complex with o-carboxybenzenediazoaminoazobenzene in the presence of p-octylpolyethyleneglycol phenylether(OP)in a borax buffer(pH 9.7～10.0).The complex developed has a maximum absorption at 540 nm, with contrast △λ=126 nm,and its apparent molar absorptivity is 1.99 × 10￣5 L· mol￣(-1)·cm￣(-1),and Sandell sensitivity is 2. 95 × 10￣(-4) μg/cm￣2.The development is complete in 20 min and the color is stable for at least 12 h.Most metal ions do not interfere. Beer’s law is obeyed up to 0. 20μg/ml nickel,the detection limit being 0.0004 μg/ml.The method has been applied to the determination of nickel in ore and alloy steel samples in the presence of masking agents,and the results obtained agreed with the certified values,theRSDs(n=6)were 1.8% and 3.1% respectively,there coveries were 95.0%～101.2 %.

关 键 词：分光光度法 邻羧基苯基 重氮氨基偶氮苯 镍 

分 类 号：O614.813[理学—无机化学]