研究了新合成的双噻唑偶氮类试剂２，６－二偶氮－［１，１′－（２，２′－二萘酚）］苯骈［１，２－ｄ：４，５－ｄ′］二噻唑（ＢＤＴＡＮ）与Ｃｕ２＋的显色反应。在ＴｒｉｔｏｎＸ－１００存在下，ｐＨ６～ｐＨ７的范围内，该试剂与Ｃｕ２＋形成物质的量比为２∶１的络合物，络合物对试剂空白的最大吸收波长λｍａｘ＝６２５ｎｍ，ε为３．８×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，Ｃｕ２＋的质量浓度在０～２０μｇ／２５ｍＬ范围内遵循比尔定律。许多常见的共存离子不干扰Ｃｕ２＋的测定。该方法具有简便、快速、选择性好等特点。已用于实际样品中微量铜的测定。 The new synthesis of bis-thiazole azo reagent 2,6-diazo- [1,1 ’- (2,2’-bnaphthol)] benzene 骈 [1,2-d: 4,5-d ’] Dithiazole (BDTAN) with Cu2 +. In the presence of Triton X-100, the complex has a 2: 1 molar ratio of the reagent to Cu 2+ -based species in the range of pH 6 to pH 7, and the maximum absorbance wavelength λ max of the complex to the reagent blank is 625 nm and ε is 3. 8 × 104L · mol-1 · cm-1. The mass concentration of Cu2 + obeys Beer’s law in the range of 0 ~ 20μg / 25mL. Many common coexisting ions do not interfere with Cu2 + determination. The method is simple, fast, good selectivity and so on. Has been used for the determination of trace copper in actual samples.