Abstract
Flow-modulated comprehensive two-dimensional gas chromatography with simultaneous monitoring of the separation by flame ionization (GC×GC-FID) and quadrupole mass spectrometric (GC×GC-qMSD) detection was studied for the analysis of gasoline and kerosene samples. The acquisition frequency of the FID was 100Hz and of the qMSD 18Hz for the mass range m/z 40–300. The instrumental set-up is such that both one-dimensional (GC-FID and GC-qMSD) and two-dimensional separations using the same working conditions can be performed. Gasoline and kerosene samples were analyzed on the column combination HP-5MS (1D)+HP INNOWax (2D). Three modulated peaks were obtained for each hydrocarbon present above 0.1% with ca. 300ms peak width at the base using 6 s modulation times. Modulated peaks in GC×GC-FID were thus characterized by ca. 30 points while those in GC×GC-qMSD method by 6–8 points only. The FID speed is sufficient for reliable quantitative analysis, while the qMSD scan speed is perfectly appropriate for identification purposes. Moreover, in the GC×GC-qMSD method considerably improved quality of uncorrected spectra was obtained, arising from the enhanced separation over one-dimensional GC-MSD analysis. Spectral match qualities of up to 98% were found.
Published Version
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