新显色剂安替比林偶氮连苯三酚的合成及其在钨光度法中的研究与应用

Synthesis of Antipyrineazopyrogallol and Spectrophotometric Studies on Its Colour Reaction with Tungsten

本文合成了安替比林偶氮连苯三酚(AnAP),并研究了与钨的显色反应。结果表明,在溴代十六烷基三甲铵(CTMAB)存在下,W与AnAP在醋酸性介质(pH=5～6)中形成1∶2的络合物。λ_(max)=475nm,ε=6.44×10~4。钨量在0～65μg/25mL范围内符合比耳定律。用盐酸联胺与EDTA掩蔽Mo(Ⅵ)等干扰元素后,用于钨尾矿中微量钨的测定。

This paper describes the chemical synthesis of antipyrineazopyrogallol (AnAP), and its spectrop hotometric reaction of AnAP with tungsten. In the presence of surfactant CTMAB at pH 5～6, the reagent reacts with tungsten to form a orange complex having a composition of W: AnAP=1:2. The complex has an absorption maxinum at 475nm, and its molar absorptivity is 6.44×10~4 L.mol^(-1). cm^(-1). Beer's law is obeyed for tungsten in the range of 0～65μg/25mL. In the presence of masking agent, the colour reaction can be applied to the spectrophotometric determination of tungsten in tungstate tailings.