镓(Ⅲ)—溴邻苯三酚红—邻菲啰啉三元配合物的研究

STUDY AND APPLICATION OF GALLIUM-BPR-PHEN SYSTEM

本文拟定了一种微量镓(Ⅲ)的测定方法:当有聚乙烯醇存在时,在PH3.6的醋酸—醋酸钠缓冲溶液中,镓(Ⅲ)能与溴邻苯三酚红及邻菲啰啉形成兰紫色三元配合物,λ_(max)=615nm,镓(Ⅲ)的量在0.095～35μg/25ml范围内符合比尔定律。其表观摩尔吸光系数ε_(615)=3.69×10~4,此法用于铝合金中微量镓(Ⅲ)的测定,相对偏差小于3％,结果准确度高。

In solution at PH 3.6 Ga(Ⅲ) reacts with BPR and Phen to form a purplecomplex. The apparent molar absorptivity of the complex may reach 3.69×10~4L·mol^(-1)·cm^(-1) at 615nm. Beer's law is obeyed in the range 0. 095～35нg Ga/25ml.Ga:BPR:Phen=1:2:1. The addition recovery of Ga is 96～104%. The methodis used to determine trace Ga in sample of aluminium alloy.