研究了新显色剂2-[2-苯骈噻唑偶氟]-5-二乙氨基苯甲酸[简称BTAEB]与铜的显色反应。试验结果表明,在pH 3.5～6.5范围内及丙酮存在下,Cu(Ⅱ)与BTAEB形成一稳定的蓝色配合物,其组成比为1:1,最大吸收波长为655nm,表观摩尔吸光系数为5.9×10~4,铜浓度在0～25μg/25ml范围内符合比耳定律。该方法灵敏度高、选择性好。应用于铝合金和工业污水中微量铜的测定,结果令人满意。 The color reaction of the new chromogenic reagent 2- [2-benzothiazole-2-fluoro-5-diethylamino benzoic acid [abbreviated as BTAEB] with copper was studied. The results showed that Cu (Ⅱ) forms a stable blue complex with BTAEB in the pH range of 3.5 ~ 6.5 and in the presence of acetone with a composition ratio of 1: 1 and a maximum absorption wavelength of 655 nm. The apparent molar absorptivity 5.9 × 10 ~ 4, copper concentration in the range of 0 ~ 25μg / 25ml Beer’s law. The method has high sensitivity and good selectivity. Applied to the determination of trace copper in aluminum alloy and industrial sewage, the result is satisfactory.