4-(4-甲基-2-硝基苯重氮基)氨基-4'-氯偶氮苯的合成及其与汞(Ⅱ)的显色反应  

Synthesis of 4-(4-Methyl-2-Nitrophenyldiazo)amino-4′-chloroazobenzene and its colour reaction with Mercury(Ⅱ)

作　　者：王贵芳[1] 邓德华[1] 杜晶晶[1] 杨凤云[1] 

机构地区：[1]安阳师范学院化学化工学院,安阳455002

出　　处：《分析试验室》2012年第12期57-60,共4页Chinese Journal of Analysis Laboratory

基　　金：河南省科技攻关计划项目(082102270035);河南省教育厅科技攻关课题(2008B150001);安阳市科技攻关课题(20093473);安阳师范学院大学生创新基金项目资助

摘　　要：合成了新显色剂4-(4-甲基-2-硝基苯重氮基)氨基-4'-氯偶氮苯(简称MNDACB),并研究了其在Triton X-100存在下与Hg(Ⅱ)的显色反应。结果表明,在pH 11.0的Na2B4O7-NaOH缓冲介质中,试剂与Hg(Ⅱ)形成稳定的红色配合物,最大吸收波长位于495 nm,表观摩尔吸光系数为1.45×105L.mol-1.cm-1,Hg(Ⅱ)的质量浓度在0～0.8μg/mL范围内服从比耳定律。所拟方法操作简便,灵敏度高,用于废水中微量Hg(Ⅱ)的测定,结果满意。A new reagent 4-（-4-methy-2-nitrophenyldiazo）-4＇-nitroazobenzene（abbreviated as MNDACB below） was synthesized,and its colour reaction with Hg（Ⅱ） was studied.In the presence of Triton X-100,Hg（Ⅱ） reacts with MNDACB to form a red complex in a medium of Na2B4O7-NaOH buffer of pH11.0.The apparent molar absorptivity is 1.45×105 L·mol-1·cm-1 at the maximum absorption of 495 nm,and Beer＇s Law is obeyed in the concentration range of 0~0.8μg/mL for Hg（Ⅱ）.The method is simple,and it has high sensitivity.It has been applied to the determination of trace amounts of Hg（Ⅱ） directly in waste water with satisfactory results.

关 键 词：4-(4-甲基-2-硝基苯重氮基)氨基-4'-氯偶氮苯 合成 汞(Ⅱ) 分光光度法 

分 类 号：O657.3[理学—分析化学]