Determination of aromatic hydrocarbons in gasolines by flow modulated comprehensive two-dimensional gas chromatography.
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.
Diehl
John W
JW
ExxonMobil Research and Engineering, Corporate Strategic Research, Analytical Sciences Laboratory, Paulsboro Technical Center, Paulsboro, NJ 08066, USA. john.w.diehl@exxonmobil.com
Di Sanzo
Frank P
FP
D002138:Calibration; D002849:Chromatography, Gas / Q000295:instrumentation* / Q000379:methods*; D005410:Flame Ionization / Q000379:methods; D005742:Gasoline / Q000032:analysis*; D006841:Hydrocarbons, Aromatic / Q000032:analysis*; D015203:Reproducibility of Results
D005742:Gasoline; D006841:Hydrocarbons, Aromatic