探讨了新显色剂 1 羟基 2 ( 5 NO2 2 吡啶偶氮 ) 8 氨基 3,6 萘二磺酸 (简称 5 NO2 PAH)与铜离子显色的适宜条件及其共存离子的影响 ,建立了 5 NO2 PAH测定铜的新显色反应体系。在pH 7.0～ 1 0 .0范围内 ,铜与试剂形成稳定的1∶2配合物 ,其最大吸收峰位于 65 3nm ,表观摩尔吸光系数εCu=4.68× 1 0 4L·mol- 1 ·cm- 1 ,铜的浓度在 0 μg/1 0mL～ 1 4μg/1 0mL范围内遵守比尔定律。方法已用于合金中铜的测定 The effects of the new chromogenic reagent 1 hydroxyl 2 (5 NO 2 2pyridine azo) 8 amino 3,6 naphthalenedisulfonic acid (referred to as 5 NO 2 PAH) and copper ions on the suitable conditions and their coexisting ions were discussed. NO2 PAH determination of copper color reaction system. In the range of pH 7.0 ~ 1.0, copper and the reagent form a stable 1: 2 complex with the maximum absorption peak at 653nm and the apparent molar absorptivity εCu = 4.68 × 104L · mol-1 · cm- 1, Beer’s law is obeyed in the range of 0 μg / 10 mL to 14 μg / 10 mL. The method has been used for the determination of copper in alloys