在阳离子表面活性剂溴化十六烷基三甲基铵存在下 ,于 p H=9.2的硼砂缓冲介质中 ,5 - (2 -苯并噻唑偶氮 ) - 8-氨基喹啉与钴 ( )形成 2∶ 1的蓝色配合物 ,其最大吸收波长位于 6 5 0 nm处 ,表观摩尔吸光系数为 1.2 4× 10 5L· mol-1· cm-1。钴浓度在 0— 10 .0μg/2 5 m L范围内 ,符合比耳定律。应用于维生素 B12 和水系沉积物中微量钴的测定 ,获得了满意的结果。 In the presence of cetyltrimethylammonium bromide, a cationic surfactant, in a borax buffer medium with p H = 9.2, the reaction of 5 - (2 - benzothiazolylazo) - 8 - aminoquinoline with cobalt The blue complex of 2: 1 was formed. The maximum absorption wavelength was at 650 nm with an apparent molar absorptivity of 1.2 4 × 10 5 L · mol -1 · cm -1. Cobalt concentration in the range of 0-10. 0μg / 2 5 m L, in line with Beer’s law. Applied to the determination of trace cobalt in vitamin B12 and sediments, satisfactory results were obtained.