Determination of aromatic hydrocarbons in gasolines by flow modulated comprehensive two-dimensional gas chromatography |
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Authors: | Diehl John W Di Sanzo Frank P |
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Institution: | ExxonMobil Research and Engineering, Corporate Strategic Research, Analytical Sciences Laboratory, Paulsboro Technical Center, Paulsboro, NJ 08066, USA. john.w.diehl@exxonmobil.com |
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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. |
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Keywords: | Gas chromatography Comprehensive two-dimensional Gasolines Hydrocarbons aromatic |
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