气相色谱毛细管柱切割-反吹技术及归一化法分析汽油中的芳烃

摘要

A simple and efficient method based on the technique of capillary column switching-back flushing was developed for the detailed analysis of aromatic hydrocarbons in gasoline. The early eluting components from a pre-column and the components of interest eluting from an analytical column are all directed to a flame ionization detector through a tee piece, which facilitates the quantitation of aromatic hydrocarbons in gasoline by normalization method. Real samples were analyzed and RSD≤3%. The operation is simple and easy, and the switching time window is ±5 s.%发展了一种采用毛细管气相色谱柱切割-反吹技术分析汽油中芳烃的方法.利用强极性毛细管预柱将芳烃保留至n-C10的脂肪族化合物之后,并将其反吹到非极性毛细管柱中按沸点详细分离分析.该方法使预柱先流出的组分和分析柱流出的组分通过一个微型三通进入同一检测器中,因此可用归一化方法定量分析汽油中的芳烃.该方法可在15 min内完成汽油中苯至C10芳烃的分析,结果的相对标准偏差(RSD)≤3%,切割误差为±5 s时分析结果的RSD≤4%.文中还对该方法的装置和部分应用进行了讨论.