2-[(对-苯偶氮苯)-三氮烯]苯甲酸与锑的显色反应研究及其应用  

Study on the color reaction of 2-[(p-phenylazobenze)-triazen]benzoic acid with stibium and its application

作　　者：张夏红[1] 章汝平[1] 何立芳[1] 黄玲玲[1] 黄剑锋[1] 

机构地区：[1]龙岩学院化学与材料学院,福建龙岩364000

出　　处：《冶金分析》2010年第2期30-33,共4页Metallurgical 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：合成了新显色剂2-[（对-苯偶氮苯）-三氮烯]苯甲酸（PABTB）,并研究了该试剂在阳离子表面活性剂CTMAB存在下与锑离子的显色反应。将邻氨基苯甲酸重氮化得到重氮盐溶液,然后重氮盐与对氨基苯偶氮苯发生偶联反应,产物经提纯和重结晶后得到PABTB。通过元素分析和红外光谱检验确认其为目标产物。在pH 10.18的硼砂和氢氧化钠缓冲溶液介质中,锑与该试剂形成摩尔比为1∶2的红色络合物,其表观摩尔吸光系数为1.686×10^5L·mol^-1·cm^-1,锑离子的浓度在0-0.7 mg/L范围内符合比尔定律。用该试剂成功地测定了矿样中微量锑。A new reagent 2-[（p-phenylazobenze）-triazen]benzoic acid（PABTB） has been synthesized and used as a sensitive reagent for the spectrophotometric determination of Sb（Ⅲ）.Anthranilic acid was dizotized to form a dizonium salt which had a coupling reaction with 4-amino-phenyl azobenzene.The product was confirmed as the object reagent by element analysis and IR spectrum after it was purified and recrystallized.In the presence of CTMAB,the reagent reacted with Sb（Ⅲ）to form a red complex（1∶2）in the buffer solution of Na2B4O7-NaOH at pH 10.18.The apparent molar absorptivity was 1.686×10^5 L·mol^-1·cm^-1.Beer＇s law was obeyed in the range of 0-0.7 mg/L for Sb（Ⅲ）.The reagent had been successfully applied to the determination of micro Sb（Ⅲ） in ore samples.

关 键 词：2-[(对-苯偶氮苯)-三氮烯]苯甲酸 合成 锑 显色反应 

分 类 号：O657.32[理学—分析化学]