新试剂3,5-二溴-4-偶氮-8-羟基喹啉苯基荧光酮的合成及其光度法测定钨的研究

Synthesis of a new reagent DBAHQPF and study on the spectrophotometric determination of tungsten

报道了新试剂３，５－二溴－４－偶氮－８－羟基喹啉苯基荧光酮的合成方法。研究了在表面活性剂ＣＴＭＡＢ存在下，试剂与钨的显色反应，在０．６ｍｏｌ·Ｌ－１盐酸介质中，钨与试剂形成１∶２的红色三元胶束配合物，其最大吸收波长为５３８ｎｍ，表观摩尔吸光系数为１．３８×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，钨含量在０～１０μｇ／２５ｍＬ范围内符合比耳定律。拟定的方法用于钢铁样品中微量钨的测定，结果满意。

The synthesis of 2,3,7-trihydroxy-9-[3,5-dibro-mo-4-(8-hydroxy-5-quinolylazo)] phenylfluorone (DBAHQPF) is reportedIn the presence of CTMAB,the colour reaction of tungsten(Ⅵ) with DBAHQPF in 06mol·L-1 hydrochloric acid medium was studiedTungsten reacts with the reagent to form a red ternary micellar complex (1∶2) which has a maximum absorption at 538nm with a molar absorptivity of 1.38×105L·mol-1·cm-1Beer′s law is obeyed for 0～10μg of tungsten in 25mL solutionThe method has been applied to determine tungsten in steels with satisfactory results