毛细管气相色谱法测定煤油中正构烷烃浓度的分布

Determination of the Concentration of C8桟18 Normal Alkanes in Kerosene by the Capillary Gas Chromatography

油品中正构烷烃浓度的分布决定了油品的许多特性,因此对于正构烷烃浓度的测定,前人提出过双柱法,用分子筛吸附然后测定脱附物等方法。而本项工作只采用一根毛细管柱,对胜利航煤中正构烷烃的测定达到了操作简单、测定速度快、计算准确等令人满意的结果。 实验部分 (一)仪器及药品 SC-7型气相色谱仪(四川分析仪器厂),φ0.2mm×59m SE-30玻璃毛细管柱,FID检测,0.5μl进样器,氮气载气(纯度≥99.99％,经净化管净化),压缩空气助燃(经净化),除n-C_(11)外从C_8—n-C_(18)均为色谱纯标样,试样为180～280℃馏份的胜利油田航空用煤油。

Under the conditions mentioned in this paper, the determination of the concentration of C8-C18 normal alkanes in kerosene can be simplified. Application of program temperature makes every component be separated at its retention temperature, and so greatly increases the resolution (R>1.5). Since we use internal standard for the quantitatioa of alkanes, the results are not affected by the amount injected and operating conditions, and the accuracy is improved.