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在非离子表面活性剂ＯＰ存在下，新有机试剂４－（６－溴－２－苯并噻唑偶氮）邻苯二酚（６－Ｂｒ－ＢＴＡＰＣ）与钼（Ⅵ）在ｐＨ４．７～５．５范围内发生高灵敏显色反应，形成稳定的、带负电荷的、紫红色三元胶束配合物。该配合物中Ｍｏ（Ⅵ）与６－Ｂｒ－ＢＴＡＰＣ的组成比为１２；其λｍａｘ为５７６ｎｍ，对比度（Δλ）高达１３６ｎｍ；在２０℃、μ０．１和ｐＨ５．０时，其表观稳定常数为１．１×１０１０，表观摩尔吸收系数ε５７６为８．５４×１０４Ｌｍｏｌ－１ｃｍ－１。钼（Ⅵ）含量在０～０．７２ｍｇ／Ｌ范围内遵从比耳定律。该显色反应不仅具有高灵敏度，而且具有较高的选择性。建议了配合物的结构。本法用于合金钢试样中小量或痕量钼的测定，取得了满意的结果。
The new organic reagent 4- (6-bromo-2-benzothiazolylazo) pyrocatechol (6-Br-BTAPC) was reacted with molybdenum (Ⅵ) in the presence of nonionic surfactant OP at pH4.7-5 .5 range of highly sensitive chromogenic reaction to form a stable, negatively charged, purple-red ternary micellar complexes. The composition ratio of Mo (Ⅵ) to 6-Br-BTAPC in this complex was 12; λmax was 576 nm and contrast (Δλ) was as high as 136 nm; at 20 ℃, μ0.1 and pH5.0, its apparent stability constant Was 1.1 × 1010, and the apparent molar absorptivity ε576 was 8.54 × 104 Lmol-1cm-1. Beer’s law is obeyed in the range of 0 ~ 0.72mg / L for molybdenum (Ⅵ). The color reaction is not only highly sensitive but also highly selective. The structure of the complex is suggested. This method is used for the determination of small or trace amounts of molybdenum in alloy steel samples and achieved satisfactory results.