新显色剂4,4′-二硝基苯基重氮氨基偶氮苯的合成及其与镉的显色反应  

Synthesis of 4,4′-dinitrobenzenediazoaminoazobenzene and its colour reaction with cadmium(Ⅱ)

作　　者：王贵方[1] 

机构地区：[1]安阳师范学院化学系,安阳455002

出　　处：《分析试验室》2006年第6期21-24,共4页Chinese Journal of Analysis Laboratory

基　　金：安阳市科技局资助课题(2005030)

摘　　要：合成了新试剂4,4＇-二硝基苯基重氮氨基偶氮苯（简称DNBDAA）,并研究了在Triton X-100存在下其与镉的显色反应.在pH 8.5的Na2B4O7-HCl缓冲介质中,Cd（Ⅱ）与试剂形成1：2的红色配合物,最大吸收波长为524 nm,表观摩尔吸光系数为1.66×10^5L·mol^-1·cm^-1,镉质量浓度在0～0.7μg/mL范围内服从比耳定律.方法已用于废水中微量镉的直接测定.The synthesis of a new reagent 4,4＇-dinitrobenzenediazoaminoazobenzene （DNBDAA） and its colour reaction with cadmium（ Ⅱ ） were studied. In the presence of Triton X-100, Cd（ Ⅱ ） reacted with DNBDAA to form a red complex with molor ratio of 1：2 in a medium of Borax-HCl buffer of pH 8.5. Its apparent molor absorptivity is 1.66×10^5L·mol^-1·cm^-1 at the maximium absorption of 524 nm. Beer＇s law was obeyed in the concentration range of 0 - 0.7 μg/mL for Cd（ Ⅱ）. The method has high sensitivity and good selccttivity. It has been applied to the determination of cadmium directly in waste water with satisfactory results.

关 键 词：分光光度法 镉 4 4'-二硝基苯基重氮氨基偶氮苯 合成 

分 类 号：O657.32[理学—分析化学]