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在pH 7.8～ 9.5的硼砂缓冲溶液中 ,在CTMAB的存在下 ,钴 (Ⅱ )与新显色剂 (2 胂酸基苯基偶氮 ) 8 氨基喹啉 (o APAQ)反应生成蓝绿色络合物 ,在 610nm处有吸收峰。显色剂本身在此条件下的吸收峰位于 4 5 0nm处 ,对比度 (Δλ)达 160nm。显色反应须在 70～ 80℃的水浴中加热 10min完成 ,可稳定至少 12h ,对常见的共存离子作了干扰试验 ,将此反应用于维生素V12 注射液及废水中微量钴的光度测定。经试验测定的准确度和精密度较满意
Cobalt (II) reacts with o-aminoquinoline (oAPAQ) in the presence of CTMAB at a pH of 7.8-9.5 to form a cyan complex There is an absorption peak at 610 nm. The chromogenic agent itself has an absorption peak at 405 nm and a contrast (Δλ) of 160 nm. The color reaction should be completed by heating in water bath at 70-80 ℃ for 10min, stable for at least 12h, interfering with common coexisting ions. The reaction was used to determine the trace cobalt in vitamin V12 injection and waste water. After testing the accuracy and precision of more satisfied