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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 15min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± 5s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
A method for the analysis of aromatics in gasoline using capillary GC column backflushing was developed. The aromatics are retained to nC10 aliphatic compounds using a strongly polar capillary precolumn and backflushed into a non-polar capillary column for detailed breakdown analysis by boiling point. In this method, the components flowing out of the pre-column and the components flowing out of the analytical column enter the same detector through a micro-tee, so that the aromatics in the gasoline can be quantitatively analyzed by the normalized method. This method can be used to complete the analysis of benzene to C10 aromatics in gasoline within 15 min. The results show a relative standard deviation (RSD) ≤ 3% and a RSD ≤ 4% when the cutting error is ± 5 s. The article also discusses the device and some applications of this method