新显色剂3,5-二(1-羧基-4,5-二甲氧基-2-苯氨基偶氮基)苯甲酸与铜(Ⅱ)的显色反应  

Study on Color Reaction of 3,5-Bis(1-Carboxy-4,5-Dimethoxy-2-Benzeaminoazo) Benzoic Acid with Copper(Ⅱ)

作　　者：乔永生[1,2] 樊月琴[2] 孟双明[2] 刘慧君[2] 

机构地区：[1]太原理工大学精细化工研究所,太原市030024 [2]山西大同大学化学与化工学院

出　　处：《光谱实验室》2010年第3期1125-1127,共3页Chinese Journal of Spectroscopy Laboratory

摘　　要：研究了新显色剂3,5-二(1-羧基-4,5-二甲氧基-2-苯氨基偶氮基)苯甲酸(CDMOBAABA)与铜(Ⅱ)的显色反应。在TritonX-100存在下,于pH9.5的NH3-NH4Cl缓冲介质中,CDMOBAABA与铜(Ⅱ)形成棕红色配合物。试剂与络合物的最大吸收波长分别为450nm和540nm。表观摩尔吸光系数为2.43×105L·mol-1.cm-1。铜(Ⅱ)含量在0—20μg/25mL范围内符合比耳定律。该方法用于铝合金样品中铜的测定,结果与原子吸收光谱法相吻合,相对标准偏差1.89%。The color reaction of 3,5-bis（1-carboxy-4,5-dimethoxy-2-benzeaminoazo）benzoic acid （CDMOBAABA） with copper（Ⅱ） was studied.In the presence of Triton X-100,the reagent reacts with copper （Ⅱ） to form a red complex in pH 9.5 NH3-NH4Cl buffer solution.The maximum absorption of the reagent and the complex are at 470nm and 540nm,respectively.The molar absorption coefficient is 2.43×105L·mol-1·cm-1 for the complex.Beer＇s law was obeyed in the range of 0—20μg/25mL for copper（Ⅱ）.This method has been applied to the determination of copper in aluminum alloy samples with RSD of 1.89%.The results of the method are in agreement with those of AAS.

关 键 词：3 5-二(1-羧基-4 5-二甲氧基-2-苯氨基偶氮基)苯甲酸 分光光度法 铜(Ⅱ) 显色反应 

分 类 号：O657.32[理学—分析化学]