Micellar catalysis in flow injection systems: the nitrosation reaction.
Micellar catalysis in flow injection systems: the nitrosation reaction.
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流动注射系统中的胶束催化：亚硝化反应。
DOI：
10.1039/an9921701833
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
Dorsey,JG
中科院分区：
文献类型：
--
作者：
Johnson,BF;Malick,RE;Ghearing,B;Dorsey,JG
在流动注射中使用水性胶束载体流被示出催化在线反应，从而相对于非胶束系统提高灵敏度。研究了几种不同的胶束体系对酸性溶液中N，N-二乙基苯胺亚硝化反应的影响。讨论了胶束增敏的机理，并比较了胶束增敏和水增敏两种介质中方法的灵敏度。阳离子表面活性剂，十六烷基三甲基溴化铵的存在下，被证明，以提高分析的灵敏度。考察了胶束溶液对体系分散特性的影响。胶束相的更大粘度增加了非反应体系的分散，但当监测反应产物时，增加的反应速率可以抵消这一点，并且胶束载体可以显示出比水性载体更少的总体分散。
The use of aqueous micellar carrier streams in flow injection is shown to catalyse on-line reactions and thereby improve the sensitivity relative to non-micellar systems. The effect of several different micellar systems on the nitrosation reaction of N,N-diethylaniline in acidic solution was investigated. The mechanism of the micellar enhancement is discussed and the sensitivities of the method in both aqueous and micellar media are compared. The presence of the cationic surfactant, cetyltrimethylammonium bromide, is shown to improve the sensitivity of the analysis. The effect of the micellar solution on the dispersion characteristics of the system was also studied. The greater viscosity of the micellar phase increases dispersion for non-reacting systems, but when monitoring a reaction product the increased reaction rate can counteract this and the micellar carrier can show less over-all dispersion than the aqueous carrier.