2-(2-噻唑偶氮)-5-磺丙氨基苯酚与铜的显色反应研究及应用  

Study on the chromogenic reaction of copper(Ⅱ) with 2-(2-thiazolylazo)-5-sulfopropylaminophenol and its applications

作　　者：马卫兴[1] 章婷婷[1] 何广洲[1] 金志文[1] 许兴友[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6期77-80,共4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(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)

摘　　要：研究了2-（2-噻唑偶氮）-5-磺丙氨基苯酚（TASPAP）与铜离子的显色反应。试剂与铜离子在pH5．6的Clark—Lubs缓冲溶液中形成2：1的稳定紫红色络合物，该络合物的最大吸收波长λmax在552nm处，铜质量浓度在0～2．00mg／L范围内服从比尔定律，其表观摩尔吸光系数ε552为4．58×10^4L·mol^-1·cm^-1。纯铝或铝合金经过盐酸溶解、双氧水氧化和氨水沉淀分离出铜离子，采用氟化钠掩蔽高铁离子，测得铜的含量与1-（2-苯并噻唑偶氮）-2-羟基-3-萘甲酸法所得结果一致，相对标准偏差在2．3％～2．6％；水样中微量铜的测定，加标回收率为98．0％～101．6%。The chromogenic reaction of 2-（2-thiazolylazo）-5-sulfopropylaminophenol （TASPAP） with copper （Ⅱ） in aqueous solution was studied. Cu^2＋ could react with TASPAP, forming a stable purple complex at pH 5.6. The maximum absorption peak of this complex lay at 552 nm and its ε552 = 4.58 × 10^4 L · mol^-1 · cm^-1. Beer＇s law was obeyed in the range of 0-2.0 mg/L Cu^2＋. Pure aluminum or aluminum alloy samples was dissolved in HCl When H2O2 and NH3 · H2O were added to the sample solution,Cu^2＋ forms a precipitation to separate Cu^2＋ The inference from Fe^3＋ was masked by NaF solution. The proposed method has been applied to the direct determination of copper in aluminieem alloy and the result was in agreement with those of 1-（2-benzothiazolylazo）-2-hydroxy-3-naphthoie acid speetrophotometry. The relative standard deviation was 2.3 % to 2.6 %, and the recoveries obtained by the standard addition method were in the range of 98. 0%-101.6% in water samples.

关 键 词：2-(2-噻唑偶氮)-5-磺丙氨基苯酚 分光光度法 铜 

分 类 号：O657.32[理学—分析化学]