钨与溴邻苯三酚红-罗丹明6G协同显色的研究及其应用

The Study on the Synergistic Colour Reaction of Tungsten with Bromopyrogallor and Rhodamine 6G and its Application

本文研究了在聚乙二醇辛基苯基醚（ＯＰ）存在下，在硫酸介质中，钨与溴邻苯三酚红和罗丹明６Ｇ双试剂协同显色反应，反应结果形成红色络合物，最大吸收波长５７８ｎｍ，表观摩尔吸光系数４．４１×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。钨量在０～８μｇ／２５ｍＬ范围内符合比尔定律。用于合金钢中钨的测定，结果满意。

A method is proposed for the spectrophotometric determination of tungsten with bromopyrogallol and rhodamine 6G by synergistic colour reaction.A red coloured complex is formed in dilute sulfuric acid medium containing OP,with a molar absorptivity of 4.41×10 5L·mol -1 ·cm -1 at 578nm.This method has been used for the determination of tungsten in alloys with satisfactory results.