4-(2-噻唑偶氮)连苯三酚分光光度法测定钢中微量钨  

Sepectrophotometric determination of micro tungsten in steel sample with 4-(2-thiazolylazo)-1,2,3,-thrihydroxy-benzene

作　　者：马卫兴[1] 薛永刚[1] 周亚文[1] 章婷婷[1] 

机构地区：[1]淮海工学院化学工程学院,江苏连云港222005

出　　处：《冶金分析》2009年第7期75-77,共3页Metallurgical Analysis

基　　金：江苏省高校自然科学研究计划资助项目(05KJB150003);全国化工高等教育科学研究"十一五"规划立项课题(No.中化教协发[2007]003-33);江苏省海洋生物技术重点建设实验室资助项目(2005HS010);淮海工学院学科基金资助项目(XK200310)

摘　　要：在稀硫酸介质及溴化十六烷基吡啶（CPB）存在下，试剂4-（2-噻唑偶氮）连苯三酚（TATB）与钨（Ⅵ）发生显色反应，据此建立了分光光度法测定钢样中微量钨的方法。研究发现：TATB与钨㈣形成2：1的红色络舍物，该络合物的最大吸收波长在530nm处。25mL溶液中，钨质量在0～40μg范围内服从比尔定律，测得表观摩尔吸光系数为6．16×10^4L·mol^-1·cm^-1。方法用于钢样中微量钨的测定，结果同硫氰酸盐光度法所得结果相吻合。In dilute sulfuric acid medium, 4-（2-thiazolylazo）-1, 2, 3,-thrihydroxy_benzene （TATB） could react with tungsten （Ⅵ） in the presence of cetylpyridinium bromide （CBP）. On the basis of this reaction, a method of determining micro tungsten in steel sample by spectrophotometry was established. The results showed that TATB could form a red complex with tungsten （Ⅵ） with a reagent ： tungsten（Ⅵ） composition ratio of 2 ： 1. The maximal absorption peak of the complex was at 530 nm. Beer＇s law was obeyed for tungsten（Ⅵ） in the range of 0--40μg/25 mL. The apparent molar absorptivity was 6.16×10^4L·mol^-1·cm^-1. This method had been applied to the determination of micro tungsten in steel samples, and the results were consistent with those obtained by thiocyanate spectrophotometry.

关 键 词：4-(2-噻唑偶氮)连苯三酚 分光光度法 钨 钢样 

分 类 号：O657.32[理学—分析化学]