2-[2-(5-甲基苯并噻唑)偶氮]-5-二乙氨基苯甲酸与铜的显色反应研究  

Color Reaction of Copper(II) with2- [2- (5-Methylbenzothiazolyl)azo]-5-diethylaminobenzoic Acid

作　　者：张教强[1] 颜红侠 樊学忠[2] 

机构地区：[1]西北工业大学化学工程系,陕西西安710072 [2]西安近代化学研究所三部,陕西西安710065

出　　处：《西北工业大学学报》2002年第1期151-154,共4页Journal of Northwestern Polytechnical University

摘　　要：研究了显色剂2－[2-(5－甲基苯并噻唑）偶氮]－5－二乙氨基苯甲酸（5－Me-BTAEB）与Cu^2+的显色反应，试剂与Cu^2+在PH为3．0－5．5的醇－水溶液中形成蓝色稳定的1：1配合物，其最大吸收波长为650nm，表观摩尔吸光系数为7．33×10^4L.mol^-1.cm^-1。Cu^2+的浓度在50－800μg/l时服从比尔定律。Abstract: We have developed a sensitive spectrophotometric method for measuring microamount of copper with the chromogenic reagent 2-[2-(5-methylbenzothiazolyl) azo]-5-diethylamino benzoic acid (5-Me-BTAEB) developed by us. 5-Me-BTAEB reacts with copper( II ) in aqueous ethanol solution at pH=3. 0~ 5. 5 to form a stable, blue 1 : 1 complex with an absorption maximum at 650 nm. The apparent molar absorptivity is 7. 33×10~4 L.mol-1 .cm-1. Beer's law is obeyed for copper( I ) in the range of 50~800 ug/L. We compare the sensitivity of our reagent with those of other typical heterocyclic reagents in Table 3 for measuring microamount of copper. We have applied our method to measuring microamount of copper in aluminum alloy under certain specified condition with satisfactory results.

关 键 词：2-[2-(5-甲基苯并噻唑)偶氮]-5-二乙氨基苯甲酸 5-Me-BTAEB 铜 分光光度分析 显色反应 噻唑偶氮化合物 显色剂 

分 类 号：O657.3[理学—分析化学] O626.25[理学—化学]