利用Dean-switch切换技术排除重非芳对微量苯的干扰

Elimination of interference of heavy non aromatic hydrocarbons on trace benzene by using Dean-switch technique

针对汽油、芳烃溶剂、重整原料油及生成油等样品中芳烃含量测定时苯受重非芳干扰的问题,采用Dean-switch切换技术,将强极性柱上受干扰的苯分析段切换至另一非极性柱上,使重非芳与苯完全分离。采用双FID检测器关联校正归一化法进行定量计算,实现了一次进样即可得到芳烃含量,避免了内标法操作烦琐及测定过程中有机溶剂对人体的损害,提高了工作效率。

In gas chromatographic determination of concentrations of aromatic hydrocarbons in samples of gasoline, aromatic solvent, reformed crude oil, and other oil products, benzene is subject to interference of heavy non aromatic hydrocarbons. In order to solve this problem, the Dean-switch technique is used. Benzene on the polar column is switched to a non-polar column, so that it is separated from heavy non aromatic hydrocarbons completely. Double-FID related correction normalization method is used for quantification. The concentrations of all aromatic hydrocarbons are obtained in one sample injection. The method avoids tedious operation of internal standard method and harmful effect of organic solvent on human body, and improves working efficiency.