2-(5-溴-2-吡啶偶氮)-5-二甲氨基苯胺分光光度法测定铜的研究  

Spectrophotometric Determination of Copper Using 2-(5-Bromo-2-Pyridylazo)-5-Dimethylaminoaniline

作　　者：刘伟豪[1] 刘根起[2] 

机构地区：[1]西北工业大学附属中学,陕西西安710072 [2]西北工业大学理学院应用化学系,陕西西安710129

出　　处：《广东化工》2016年第3期3-4,共2页Guangdong Chemical Industry

摘　　要：以2-（5-溴-2-吡啶偶氮）-5-二甲氨基苯胺（5-Br-PADMA）为显色剂,建立了分光光度法测定铜的新体系。实验结果表明,在p H=3.75-5.75的HAc-Na Ac缓冲溶液中,室温下铜与试剂形成配位比为1∶2的紫红色配合物,配合物最大吸收波长位于573 nm,表观摩尔吸光系数为5.89×104L·mol^-1·cm^-1。铜浓度在0-18μg/10 m L范围内符合比耳定律。所拟方法用于矿样中铜的测定,结果满意。The color reaction of 2-（5-bromo-2-pyridylazo）-5-dimethylaminoaniline（5-Br-PADMA） with copper has been studied. The experimental results showed that copper can react with 5-Br-PADMA at room temperature to form a stable purplish red complex in p H=3.75-5.75 HAc-Na Ac buffer solution. The apparent molar absorptivity of the complex is 5.89×104 L·mol^-1·cm^-1 at 573 nm. The molar ratio of copper to 5-Br-PADMA in the complex is 1∶2. Beer＇s law is obeyed in the range of 0-18 μg/10 m L for copper. The proposed method has been applied to spectrophotometric determination of copper in mine samples with satisfactory results.

关 键 词：2-(5-溴-2-吡啶偶氮)-5-二甲氨基苯胺 铜 分光光度法 

分 类 号：O614.825[理学—无机化学]