IDENTIFICATION OF ALKYLBENZENES AND DIRECT DETERMINATION OF BTEX AND (BTEX+C-3-BENZENES) IN OILS BY GC/MS

摘要

A rapid, reliable, and effective method for direct determination of benzene, toluene, ethylbenzene, and o-, m-, and p-xylenes (BTEX) and alkyl-substituted benzene components in oil has been developed using GC/MS in selected ion monitoring mode. Using this method, 58 alkyl-substituted benzene components in a light crude oil, Alberta Sweet Mixed Blend, were positively identified, and the concentrations of the individual BTEX compounds and Cs-benzene isomers in over 200 different crude and weathered oils were quantified. The effects of weathering on compositional changes of alkylbenzenes were also studied. The plots of the concentrations of BTEX and BTEX + C-3-benzenes versus weathering percentages can be used to estimate the weathering extent of weathered oil samples, especially for those short-term weathered oils for which the loss of BTEX and C-3-benzenes is significant.