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许多吡啶偶氮化合物已作为金属离子的显色试剂在分光光度法中得到应用,但有关在阴离子表面活性剂存在下利用吡啶偶氮化合物对金属离子进行光度测定的报告却很少见。苏联Чернова则认为阴离子表面活性剂在某些胶束增溶分光光度法中是一种无效的组分。我们通过实验发现,这一结论并不完全适于以吡啶偶氮化合物作为显色试剂的体系。我们曾合成过12种吡啶偶氮化合物并研究过它们在阴离子表面活性剂存在下与金属离子的反应,证明阴离子表面活性剂能改善许多吡啶偶氮化合物与金属离子的反应性质,甚至有时还是一种必不可少的有效组分。例如试剂2-(5-氯-2-吡啶偶氮)-5-
Many pyridine azo compounds have been used as chromogenic reagents for metal ions in spectrophotometry, but reports of the photometric determination of metal ions using pyridine azo compounds in the presence of anionic surfactants are rare. The Soviet Union Чернова that anionic surfactants in some micellar solubilization spectrophotometry is an ineffective component. We have found through experiments that this conclusion is not entirely suitable for pyridine azo compounds as a chromogenic reagent system. We have synthesized 12 pyridylazo compounds and studied their reaction with metal ions in the presence of anionic surfactants to demonstrate that anionic surfactants can improve the reactivity of many pyridine azo compounds with metal ions and can even sometimes be a An essential and effective component. For example, reagent 2- (5-chloro-2-pyridylazo) -5-