邻甲氧基苯基重氮氨基偶氮苯与银显色反应的研究  

A STUDY ON THE PHOTOMETRIC DETERMINATION OF SILVER WITH o-MDAA

作　　者：杨敏思[1] 王曙[1] 黄有云 

机构地区：[1]四川轻化工学院基础部,四川轻化工学院化学工程系

出　　处：《四川轻化工学院学报》1996年第4期1-4,共4页Journal of Sichuan Institute of Light Industry and Chemical Technology

摘　　要：研究了邻甲氧基苯基重氮氨基偶氮苯（ｏ－ＭＤＡＡ）、三乙醇胺（ＴＦＡ）与银的显色反应。试验表明：在Ｔｒｉｔｏｎ　Ｎ－１０１存在下及ｐＨ１０．７～１１．３的Ｎａ２Ｂ４Ｏ７－ＮａＯＨ缓冲介质中，银和ｏ－ＭＤＡＡ、三乙醇胺形成红色的三元配合物，其最大吸收波长５５０ｎｍ，表观摩尔吸光系数为９．８０×１０４Ｌ·ｍｏ１－１。银量在０～４．５μｇ／１０ｍｌ范围内符合比尔定律。试验了２０余种共存离子的影响，与巯基棉分离富集技术结合，测定了人工合成样中的微量银，结果满意。The Sensitive colour reaction of Ag+ with o-methoxybenzenediazoamnioazobenzene (o-MDAA) and trithanolamine is studied. It is shown that the red ternary complex is formeed in pH 10.7～11.3 Na2B4O7-NaO Hmedium and in the presence of triton N-101. The molar ratio of Ag+ to o-MDAA in the complex is 1:3. max of the complex is at 550 nm and the apparent molar apsorptivity is 9.80 × 104 L·mo1-1·cm-1 .Beer's Law is obeyed up to 4. 5μg/10ml for Ag+. The interference and its elimination are studied. This method is applied to determine trace ammounts of silver in a synthetic sample with satisfactory results.

关 键 词：邻甲氧基 苯基 重氮氨基 偶氮苯 显色剂 试剂 

分 类 号：O657.32[理学—分析化学] TQ421.9[理学—化学]