摘要
合成了５－（２，６－二溴－４－硝基苯基偶氮）－８－氨基喹啉（ＤＢＮＰＡＱ）新试剂．在ｐＨ９．５的硼砂缓冲溶液中，Ｔｗｅｅｎ－８０存在下，试剂与Ｃｏ（Ⅱ）形成２∶１的紫红色配合物，其最大吸收峰位于６６０ｎｍ，摩尔吸光系数为７．３８×１０４Ｌ·ｍｏｌ－１·ｃｍ－１．钴离子的量在０～１５μｇ／２５ｍＬ内符合比尔定律，所拟方法用于维生素Ｂ１２中钴离子的测定，结果满意．
The colour reaction of 5 (2,6 dibromo 4 nitrophenylazo) 8 aminoquinoline (DBNPAQ) a newly synthesized reagent with Cobalt(Ⅱ) in the presence of Tween 80 was studied. The result shows an absorption maximum at 660 nm with an apparent molar absorption of 7.38×10 4 L·mol -1 ·cm -1 .Beer's law was obeyed in the concentration range between 0￣15 μg/25 mL of Cobalt (Ⅱ). The method has been applied to the determination of trace amount of Cobalt (Ⅱ) in Vitamine B 12 with Satisfactory results.
出处
《辽宁师范大学学报（自然科学版）》
CAS
1997年第4期308-312,共5页
Journal of Liaoning Normal University:Natural Science Edition
