新有机试剂4-(6-溴-2-苯并噻唑偶氮)邻苯二酚(6-Br-BTAPC)与钛(Ⅳ)在 pH3.4的40%丙酮水溶液中发生高灵敏显色反应。形成的带负电荷的配合物的组成比为2:1表观稳定常数为3.7×10~9(25℃,μ0.1),λ_(max)为570nm,对比度(Δλ)为130nm,ε_(570)高达9.21×10~4L·mol~(-1)·cm~(-1)。建议了配合物的结构。在0～13μgTi(Ⅳ)/25ml 范围内遵从比耳定律。该法用于工业水和废水中痕量钛的分光光度测定,取得了满意的结果。 The new organic reagent 4- (6-bromo-2-benzothiazolylazo) pyrocatechol (6-Br-BTAPC) reacted with titanium (Ⅳ) in 40% . The composition ratio of the negatively charged complex formed was 2: 1, the apparent stability constant was 3.7 × 10 -9 (25 ° C., μ0.1), the λ max was 570 nm, the contrast (Δλ) was 130 nm, the ε_ 570) up to 9.21 × 10 ~ 4L · mol ~ (-1) · cm ~ (-1). The structure of the complex is suggested. Beer’s law is obeyed in the range of 0 ~ 13μgTi (Ⅳ) / 25ml. The method for the determination of trace amounts of titanium in industrial water and wastewater spectrophotometry, and achieved satisfactory results.