A GC method for the quantitative determination of BTEX in gasoline

A gas Chromatographic (GC) method for the routine quantitation of benzene, toluene, ethylbenzene, and xylene isomers (BTEX) in gasoline is described. This method is an alternative to the direct injection of gasoline into the GC system via a split injector. A weight-based sample and standard preparation procedure is applied to overcome the error involved with a volume-based procedure (i.e., error due to the evaporation of light fractions), Quantitative analysis is performed using an internal standard method. Linearity is evaluated for each aromatic hydrocarbon, and correlation coefficients vary from 0.999174 to 0.999736. Precision and accuracy are evaluated.