本文对邻,邻′-二氨基偶氮苯(DAAB)的合成方法进行了改进,用改进过的方法合成DAAB简便、快速、产率较高、产品稳定、价廉。并对Cu(Ⅲ)-DAAB-SDBS-TritonX-100新显色体系作了系统的研究。在pH4到6的醋酸盐缓冲溶液中,在十二烷基苯磺酸钠(SDBS)和TritonX-100存在下,Cu(Ⅱ)与DAAB形成红色络合物。Cu(Ⅱ)-DAABSDBS-TritonX-100四元体系在530nm处摩尔吸光系数为1.0×10~4 1.mol~(-1)·cm~(-1)。铜量在0.20—5.6ppm范围内服从比耳定律,本体系选择性好。它是分光光度法测定铜的良好的新显色体系。 In this paper, the synthesis of o, o’-diaminoazobenzene (DAAB) was improved. The DAAB synthesized by the improved method was simple, rapid, high yield, stable and cheap. The new chromogenic system of Cu (Ⅲ) -DAAB-SDBS-TritonX-100 was systematically studied. Cu (Ⅱ) forms a red complex with DAAB in the presence of sodium dodecylbenzenesulfonate (SDBS) and TritonX-100 in pH 4 to 6 acetate buffer solution. The molar absorption coefficient of Cu (Ⅱ) -DAABSDBS-TritonX-100 quaternary system at 530 nm was 1.0 × 10 -4 mol·L -1 cm -1. Copper content in the range of 0.20-5.6ppm obedience Beer’s law, the system of good selectivity. It is a good new colorimetric system for the spectrophotometric determination of copper.