在非离子表面活性剂 OP 存在下,4-(2-苯并噻唑偶氮)邻苯二酚(BTAPC)与钛(Ⅳ)在 pH4.2～4.6范围内发生高灵敏的显色反应。在形成的带负电荷的三元胶束配合物中 Ti(Ⅳ)与 BTAPC 的组成比为1:2,表观稳定常数为4.3×10~(?)(25℃,μ0.1),λ_(max)为555nm,对比度(△λ)为125nm,ε_(?)高达9.70×10~4L·mol~(-1)·cm~(-1)。在0.5～14μg Ti(Ⅳ)/25mL 范围内遵从比耳定律。本法用于废水和工业用水中痕量钛的分光光度测定,结果满意。 In the presence of nonionic surfactant OP, the highly sensitive color reaction of 4- (2-benzothiazolylazo) catechol (BTAPC) with titanium (Ⅳ) occurred in the range of pH4.2 ~ 4.6. The composition ratio of Ti (Ⅳ) to BTAPC in the negatively charged ternary micelle complex is 1: 2, the apparent stability constant is 4.3 × 10 ~ (?) (25 ℃, μ0.1) (max) is 555nm, the contrast (△ λ) is 125nm, and the ε_ (?) is up to 9.70 × 10 ~ 4L · mol ~ (-1) · cm -1. Beer’s law is obeyed in the range of 0.5 ~ 14μg Ti (Ⅳ) / 25mL. This method is used for the determination of trace titanium in wastewater and industrial water with satisfactory results.