4-(3,5-二溴-2-吡啶重氮氨基)-4′-硝基偶氮苯的合成及其与镉(Ⅱ)显色反应的研究  

Studies on synthesis of 4-(3,5-dibromine2-pyridinediazoamino)-4′-nitroazobenzene and its color reaction with cadmium(Ⅱ)

作　　者：王贵芳[1] 邢云[1] 秦玉娇[1] 李明亮[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：《冶金分析》2010年第5期28-32,共5页Metallurgical Analysis

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)

摘　　要：合成了新显色剂4-(3,5-二溴-2-吡啶重氮氨基)-4′-硝基偶氮苯(简称DBPNAB),研究了在非离子表面活性剂Triton X-100存在下其与Cd(Ⅱ)的显色反应。结果表明,在pH10.2的Na2B4O7-NaOH缓冲介质中,该试剂与Cd(Ⅱ)形成摩尔比为2∶1的红色络合物,最大吸收波长位于581 nm,表观摩尔吸光系数为1.61×105L.mol-1.cm-1,镉的质量浓度在0～0.7μg/mL范围内遵守比尔定律。所拟方法用于废水中微量镉(Ⅱ)的直接测定,相对标准偏差为2.0%～3.3%,回收率为97.4%～103.6%。A new reagent 4-（3,5-dibromine-2-pyridinediazoamino）-4′-nitroazobenzene（DBPNAB） was synthesized,and its colour reaction with Cd（Ⅱ） was studied.In the presence of Triton X-100,Cd（Ⅱ） reacted with DBPNAB to form a red complex（1∶2）in a medium of Na2B4O7-NaOH buffer of pH 10.2.The apparent molar Absorptivity of the complex was 1.61×105 L·mol-1·cm-1 and the maximum Absorption was 581 nm.Beer＇s law was obeyed in the concentration range of 0-0.7 μg/mL for Cd（Ⅱ）.The method has been applied to the direct determination of cadmium（Ⅱ） in waste water with RSD of 2.0 %-3.3 % and recovery of 97.4 %-103.6 %.

关 键 词：4-(3 5-二溴-2-吡啶重氮氨基)-4′-硝基偶氮苯 合成 镉(Ⅱ) 分光光度法 

分 类 号：O657.32[理学—分析化学]