2-[(对-苯偶氮苯)-三氮烯]苯甲酸与锡的显色反应  

Color Reaction of Tin with 2-[(p-Phenylazobenzene)-triazene]-benzoic Acid

作　　者：何立芳[1] 章汝平[1] 李锦辉[1] 林水东[1] 

机构地区：[1]龙岩学院化学与材料学院,龙岩364000

出　　处：《理化检验（化学分册）》2010年第12期1407-1409,1412,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：福建省自然科学基金资助项目(E0610001);福建省科技厅资助省属高校项目(2007F5081);福建省教育厅科学研究资助项目(JB08234)

摘　　要：在pH9.8硼酸盐缓冲介质中并有Triton X-100存在时,锡(Ⅱ)与2-[(对-苯偶氮苯)-三氮烯]苯甲酸反应生成络合比为1比2的配合物,其吸收峰位于318nm波长处,在此波长测得其摩尔吸光率为2.33×10~5L·mol^(-1)·cm^(-1)。锡(Ⅱ)质量浓度在15.0mg·L^(-1)以内与其吸光度呈线性关系。在此基础上提出了测定纯铜中痕量锡的光度法。应用此方法的测定结果与常用的苯基荧光酮光度法测得的结果相符,测定值的相对标准偏差(n=5)均小于0.8%。It was found that in a borate buffer of pH 9.8 and in the presence of Triton X-100,a coordination complex of tin（Ⅱ） and 2-[（p-phenylazobenzene）-triazene]-benzoic acid（PABTB） was formed with molar ratio of 1 to 2 and having its absorption maximum at the wavelength of 318 nm.Molar absorptivity found at 318 nm was 2.33×10~5L·mol^（-1）·cm^（-1）.Linear relationship was kept in the range within 15.0 mg·L^（-1） of Sn（Ⅱ）.Based on these facts,the proposed method was applied to the determination of tin in pure copper,giving results in consistency with the results found by the phenyl-fluorone-photometric method,with values of RSD＇s（n=5） less than 0.8%.

关 键 词：光度法 2-[(对-苯偶氮苯)-三氮烯]苯甲酸 锡 显色反应 

分 类 号：O657.32[理学—分析化学]