4-(6-溴-2-苯并噻唑偶氮)邻苯二酚-钛(Ⅳ)-丙酮体系显色反应的研究

Studies on Chromogenic Reaction for 4-(6-Bromo-2-benzothiazolylazo)pyrocatechoI-Titanium(Ⅳ)-Acetone System

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。

There is the high sensitive chromogenie reaction between 4-(6-bromo-2 benzothi- azolylazo)pyrocatechol,a new organic reagent,and Ti(Ⅳ)in the 40% acetone-aqueous so- lution at pH 3.4.The component ratio of the formed and negatively charged complex is 2:1 with the apparent stability constant 3.7×10~9(25℃,μ0.1),λ_(max) 570 nm,the contrast (Δλ)130 nm and ε_(570) 9.21×10~4L·mol^(-1)·cm^(-1).The structure of the complex was suggested. Beer's law is obeyed in the range of 0 to 13 μg of Ti(Ⅳ)per 25 ml.Satisfactory results have been achieved in applying the method to the spectrophotometric determination of trace titanium in industrial water and waste water.