4-(4-氯苯重氮基)氨基-4′-氯偶氮苯的合成及其与汞(Ⅱ)的显色反应  

Synthesis of 4-(4-Chlorobenzenediazo) amino-4′-chlorineazobenzene and Its Colour Reaction with Mercury(Ⅱ)

作　　者：邓德华[1] 王贵芳[1] 杜晶晶[1] 

机构地区：[1]安阳师范学院化学化工学院,河南安阳455002

出　　处：《分析科学学报》2013年第2期235-238,共4页Journal of Analytical Science

基　　金：河南省科技攻关计划(No.082102270035);河南省教育厅科技攻关课题(No.2008B150001);安阳市科技攻关课题(No.20093473)

摘　　要：合成了新显色剂4-(4-氯苯重氮基)氨基-4′-氯偶氮苯(简称CDACAB),并研究了其与汞(Ⅱ)的显色反应。结果表明,在非离子表面活性剂OP存在下,在pH=10.5的Na2B4O7-NaOH缓冲介质中,汞(Ⅱ)与CDACAB形成1∶2橙红色络合物,其最大吸收波长位于498nm处,表观摩尔吸光系数ε=1.15×105 L.mol-1.cm-1。汞(Ⅱ)质量浓度在0～7.0μg/10mL范围内遵守比耳定律。所拟方法用于废水中微量汞(Ⅱ)的测定,相对标准偏差为1.6%～3.1%,回收率为96.5%～103.8%。A new reagent 4- （4-chlorobenzenediazo） amino-4Cchlorineazobenzene （CDACAB） was synthesized, and its colour reaction with mercury（ Ⅱ ） was studied. In the presence of OP,the reagent can react with mercury（ Ⅱ ） to form a stable orange-red complex in a medium of Na2B4OT-NaOH buffer of pH 10.5. The apparent molar absorptivity is 1. 15 × 105 L. mo1-1 · cm 1 at the maximum absorption of 498 nm. Beer＇s law was obeyed over the range of 0-7.0μg mercury（ Ⅱ ） in 10 mL solution. The method has been directly applied for the determination of Hg（ [Ⅱ） in waste water with relative standard deviation of 1.6% -3.1% and recovery of 96.5%-103.8%.

关 键 词：4-(4-氯苯重氮基)氨基-4'-氯偶氮苯 分光光度法 汞(Ⅱ) 

分 类 号：O657.32[理学—分析化学]