3,5-二羧基苯基重氮氨基偶氮苯分光光度法测定微量镍  

Spectrophotometric determination of micro nickel with 3,5-dicarboxyl-phenyl diazoaminoazobenzene

作　　者：王君玲[1] 孟双明[1] 冯锋[1] 郭永[1] 刘永文[1] 樊月琴[1] 

机构地区：[1]山西大同大学化学与生命科学学院,山西大同037009

出　　处：《冶金分析》2006年第3期59-61,共3页Metallurgical Analysis

摘　　要：合成了新三氮烯类显色剂3，5-二羧基苯基重氮氨基偶氮苯（DBDAA）。在TritonX-100存在下的碱性介质中，该试剂与Ni（Ⅱ）形成一种稳定的红色络合物，最大吸收波长为530nm；表观摩尔吸光系数为2．1×10^5L·mol^-1·cm^-1；25mL溶液中，镍质量在0～12μg内符合比尔定律。方法用于铝合金中镍的测定，相对标准偏差小于5％，与原子吸收光谱法比较，结果相符。A new chromogenic reagent 3,5-dicarboxyl-phenyl diazoaminoazobenzene（DBDAA） is synthesized and the color reaction of DBDAA with nickel（Ⅱ） is studied. Results show that a red complex of DBDAA with Ni（Ⅱ） is formed in the buffer solution of Na2B4O7-NaOH at pH 10.6 in the presence of TritonX-100. Its apparent molar absorptivity is 2.1×10^5L·mol^-1·cm^-1. The complex has a maximum absorption at 530 nm. Beer＇s law is obeyed in the concentration range of 0-12μg/25 mL. This method has been applied to the determination of nickel in aluminum alloy with RSD of less than 5%. The results of this method cornpare favourably with those of atomic absorption spectrometry.

关 键 词：合成 3 5-二羧基苯基重氮氨基偶氮苯 镍 显色反应 

分 类 号：O657.3[理学—分析化学] O614.813[理学—化学]