二甲氧基羟基苯基荧光酮光度法测定钨的研究和应用

Study on the Spectrophotometric Determination of Tungsten with Dimethoxyhydroxyphenylfluorone and Its Analytical Application

研究了新显色剂二甲氧基羟基苯基荧光酮分光光度测定钨的方法。在酸性介质中，有表面活性剂存在下，试剂与钨形成稳定的红色络合物，在 ５１５ｎｍ处具有最大吸光度，表观摩尔吸光系数ε＝８．６ｘ１０~４，钨含量在０～３５μｇ／２５ｍＬ范围内符合比尔定律．方法应用于钢中微量钨的测定，获得满意结果．

The new chromogenic reagent 2,3,7-trihydroxy-9-(3,5-dimethoxy-4-hydroxy) phenylfluorone (DMH-PF) have been synthesized and the new chromogenic reagent system of DMH-PF with tungsten in the presence of TritonX-100 have been studied. It was shown that a stable red complex can be formed in add medium. Its apparent molar absorptivity is 8.6×10~4L.mol-1.mol^(-1) at 515nm. Beer's law is obeyed in the range of 0-35μg/25mL for tungsten. The amouts of tungsten in steels can be determined in aqueous solution without saparation with satisfactory results.