新显色剂间溴偶氮羧－m与镓的显色反应及其应用研究

Investigation on a Colour Reaction of Galsium with Metabromocarboxyazo-m and Its Application in Determinations

本文作者研究了应用新显色剂间溴偶氮羧—ｍ在水相中测定微量镓的方法．镓与显色剂形成１：２的蓝色配合物．λｍａｘ为６８２ｎｍ．在ＨＣ１—ＫＣｌ介质中，ｐＨ２．３～３．２范围内，摩尔吸光系数可达１．３２×１０５Ｌ／（ｍｏｌ·ｃｍ）．最佳显色条件下，镓的含量在０～７μｇ／２５ｍｌ范围内符合比耳定律．

Metabromocarboxyazo-m, a new spectrophotometrie reagent was inve-stigated for the determination of Galsium in water. The stoichiometric composition of the blue complex is verified, being Ga: R= 1: 2. Maximum absorption Of Ga-complex is 682nm. Its molar absorptivity is ε682 = 1. 32 ×105L·mol-1· cm-1, when acidities at pH2. 3-3. 2. Galsium content within 0- 7μg/25ml, beer's law is followed.