新显色剂2-(2'-咪唑偶氮)-苯甲酸与铜(Ⅱ)的显色反应研究  

Study on the Colour Reaction of a New Reagent 2-(2'-Imidazolylazo)benzoic Acid for Copper

作　　者：葛昌华[1] 梁华定[1] 潘富友[1] 

机构地区：[1]台州师范专科学校,浙江台州317000

出　　处：《化学世界》2000年第4期218-220,共3页Chemical World

摘　　要：研究了新显色剂 2 ( 2′ 咪唑偶氮 ) 苯甲酸 (简称 IABA)与铜 ( )的显色反应条件。结果表明 ,在 p H 7的醋酸铵介质中 ,试剂与铜 ( )形成稳定的紫红色的配合物 ,最大吸收波长为 5 44nm,铜 ( )与试剂 IABA的配合比为 1∶ 2 ,表观摩尔吸光系数为 1.5 3× 10 4L mol· cm,铜 ( )浓度在 0～ 0 .8mg L范围内遵守比耳定律。该方法用于测定镁合金和铝合金中微量的铜 ,结果满意。The conditions of colour reaction of a new reagent 2 (2′ imidazolylazo) benzoic acid (IABA) for copper are reported. The results show that this new colouring reagent reacts with Cu 2+ to form a stable red complex (1∶2) in the presence of NH 4Ac at pH 7.0. The absorption maximum and apparent molar absorptivity are 544 nm and 1.53×10 4 L/mol·cm respectively. Beer's law is obeyed in the range of 0～0.8 mg/L. This method has been applied to the direct determination of copper in magnesium alloy and aluminium alloy with satisfactory results.

关 键 词：2-(2’-咪唑偶氮)-苯甲酸 分光光度法 铜 

分 类 号：TG115.335[金属学及工艺—物理冶金] O614.121[金属学及工艺—金属学]