 |
| Titel |
Comprehensive two-dimensional gas chromatography (GC × GC) measurements of volatile organic compounds in the atmosphere |
| VerfasserIn |
X. Xu, L. L. P. Stee, J. Williams, J. Beens, M. Adahchour, R. J. J. Vreuls, U. A. Brinkman, J. Lelieveld  |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 3, no. 3 ; Nr. 3, no. 3 (2003-06-10), S.665-682 |
| Datensatznummer |
250001039
|
| Publikation (Nr.) |
 copernicus.org/acp-3-665-2003.pdf |
|
|
|
|
|
| Zusammenfassung |
| During the MINOS campaign in August 2001 comprehensive
two-dimensional gas chromatography (GC x GC) was applied to the in situ measurements of atmospheric volatile organic compounds
(VOCs) at the Finokalia ground station, Crete. The measurement system employs a thermal desorption unit for on-line sampling and
injection, and a GC x GC separation system equipped with a flame ionization detector (FID) for detection. The system was
optimized to resolve C7-C14 organic components. Two-dimensional chromatograms from measurements of Finokalia air
samples show several hundred well-separated peaks. To facilitate peak identification, cartridge samples collected at Finokalia were
analyzed using the same GC x GC system coupled with a time-of-flight mass spectrometer
(TOF-MS). The resulting mass spectra were deconvoluted and compared to spectra from a database
for tentative peak identification. About 650 peaks have been identified in the two-dimensional plane, with significant
signal/noise ratios (>100) and high spectra similarities (>800). By comparing observed retention indices with those found
in the literature, 235 of the identifications have been confirmed. 150 of the confirmed compounds show up in the
C7-C14 range of the chromatogram from the in situ measurement. However,
at least as many peaks remain unidentified. For quantification of the GC x
GC measurements, peak volumes of measured compounds have been integrated and externally calibrated using a standard
gas mixture. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|