Determination of aromatic hydrocarbons in gasolines by flow modulated comprehensive two-dimensional gas chromatography

J Chromatogr A. 2005 Jul 8;1080(2):157-65. doi: 10.1016/j.chroma.2004.11.054.

Abstract

Valve based/flow modulated comprehensive two-dimensional gas chromatography-flame ionization detection (GC x GC-FID) was used for quantification of C6 through C12 aromatic hydrocarbons by carbon number in gasolines. A 0.53 mm i.d. non-polar first dimension column was coupled to a 0.53 mm i.d. polar second dimension column through a double loop eight port valve modulator. Depending on the sample type, normalized percent and internal standard (I.S.) quantification was performed. For normalized percent quantification, a one-point calibration performed with one aromatic compound per carbon number/class provided an average % accuracy of 2.1% and a short-term n--1 relative standard deviation of 1.0%. For total aromatic compounds good agreement with the more complex conventional multidimensional GC technique was obtained. However, GC x GC has certain advantages over most other methods, mainly increased selectivity for total and carbon number aromatic content. The identification of the aromatic hydrocarbons was confirmed by GC x GC-MS.

MeSH terms

  • Calibration
  • Chromatography, Gas / instrumentation*
  • Chromatography, Gas / methods*
  • Flame Ionization / methods
  • Gasoline / analysis*
  • Hydrocarbons, Aromatic / analysis*
  • Reproducibility of Results

Substances

  • Gasoline
  • Hydrocarbons, Aromatic