间溴偶氮羧-p测定微量镓的配位条件探讨

Study on Colortric Determination of Gallium with Metabromocarboxyazo-p

本文探讨了间溴偶氮羧-p与镓显色反应的最佳条件。在HC1-KC1介质中,pH=2.90～3.30范围内镓和显色剂形成1∶2的蓝色配合物,其最大吸收波长为670nm,ε=1.94×105L·mol-1·cm-1镓含量在0～0.32μg·mL-1时服从比耳定律。

Optimumconditions for Metabromcarboxyazo-preacting with Galliumwas studied in this paper.The ra-tio of Galliumto Metabuomocarbomyazo-pin HCl-KCl mediumwas1 ∶2while PHvaried from2.9～3.30.Andthe maximumabsorption was670nm.Beer's Lawwas followed whenthe concentrationof Galliumranged from0～0.32μg·mL -1 .AndMolarAbsorptioncomffient was1.94×105L·mol -1 ·cm -1 .