Abstract: The reaction of 2-(2'-imidazolylazo)phenol-4-sulfonic acid(IAP-4S) with Cu(II), Zn(II) and Fe(III) has been studied. The optimum pH ranges for the complex reaction are 5-11, 5-11 and 5-7, respectively. The reaction is completed within 2 min at room temperature. Beer's law is obeyed in the range of 0-0.0000035g/mL for Cu(II), 0-0.0000040g/mL for Zn(II), 0-0.0000035g/mL for Fe(III), and the apparent molar absorptivities of the complexes are 22800, 21100 and 14100L/mol.cm, respectively. Three components in the synthetic mixed solutions have been determined by Beckman DU-7 UV-VIS spectrophotometer with polycomponent function. The results are satisfactory.

Key words: spectrophotometer, 2-(2'-imidazolyazo)phenol-4-sulfonic acid, Cu(II), Fe(III), Zn(II), polycomponent analysis

摘要： 研究了咪唑偶氮苯酚-4-磺酸(IAP-4S)与Cu(Ⅱ)、Zn(Ⅱ)、Fe(Ⅲ)显色反应的适宜条件。对于铜、铁、钴混合试液及锌、铁、钴混合试液中3组分应用多组分分析法测定，方法简便，回收率令人满意。

关键词: 分光光度法, 咪唑偶氮苯酚-4-磺酸, 铜, 铁, 锌, 钴, 多组分分析