摘要
本文合成了新显色剂２－（８－喹啉偶氮）－咪唑（ＱＡＩ），测定了试剂的离解常数。研究了ＱＡＩ与ＣＯ（Ⅱ）的显色反应，在ｐＨ３．０～７．０的缓冲介质中，ＱＡＩ与ＣＯ（Ⅱ）形成１∶３的红色配合物，λｍａｘ＝５３０ｎｍ，表观摩尔吸光系数ε＝３．６７×１０４Ｌ．ｍｏｌ－１．ｃｍ－１，钴量在０～２５μｇ／２５ｍｌ范围内符合比耳定律。该法的优点是选择性高和操作简便，做了较大量的Ｃｕ（Ⅱ），Ｎｉ（Ⅱ），Ｆｅ（Ⅲ），Ｚｎ（Ⅱ），Ａｌ（Ⅲ）．Ｍｎ（Ⅱ）和Ｃｄ（Ⅱ）不干扰测定试验。应用于茶叶和维生素Ｂ１２中微量钴的测定，取得了令人满意的结果。
A new reagent 2-(8-quinolyla20)-imidazole (QAI) is synthesized. The properties of the reagent and its color reaction with cobalt(Ⅱ ) are studied. In a PH3. 0～7. 0 buffer solution,CO(Ⅱ ) reacts with QAI to form a 1: 3 stable complex,which shows a maximum absorption at 530 urn with an apparent absorptitity of 3. 67 × 104 L. mol￣(-1). cm￣(-1). Beer's law is obeyed in the range of 0～25 μg CO(Ⅱ ) /25 ml. The high seleetire and simple method is directly applied to determination of miroamounts of cobalt in tea and vitamine B_(12) injection. The results are satisfied.
出处
《华东地质学院学报》
1996年第4期423-426,共4页
Journal of East China Geological Institute
