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| Titel |
Quantification of biogenic volatile organic compounds with a flame ionization detector using the effective carbon number concept |
| VerfasserIn |
C. L. Faiola, M. H. Erickson, V. L. Fricaud, B. T. Jobson, T. M. VanReken |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 8 ; Nr. 5, no. 8 (2012-08-10), S.1911-1923 |
| Datensatznummer |
250003046
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| Publikation (Nr.) |
 copernicus.org/amt-5-1911-2012.pdf |
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| Zusammenfassung |
| Biogenic volatile organic compounds (BVOCs) are emitted into the atmosphere
by plants and include isoprene, monoterpenes, sesquiterpenes, and their
oxygenated derivatives. These BVOCs are among the principal factors
influencing the oxidative capacity of the atmosphere in forested regions.
BVOC emission rates are often measured by collecting samples onto adsorptive
cartridges in the field and then transporting these samples to the
laboratory for chromatographic analysis. One of the most commonly used
detectors in chromatographic analysis is the flame ionization detector
(FID). For quantitative analysis with an FID, relative response factors may
be estimated using the effective carbon number (ECN) concept. The purpose of
this study was to determine the ECN for a variety of terpenoid compounds to
enable improved quantification of BVOC measurements. A dynamic dilution
system was developed to make quantitative gas standards of VOCs with mixing
ratios from 20–55 ppb. For each experiment using this system, one terpene
standard was co-injected with an internal reference, n-octane, and analyzed
via an automated cryofocusing system interfaced to a gas chromatograph flame
ionization detector and mass spectrometer (GC/MS/FID). The ECNs of 16
compounds (14 BVOCs) were evaluated with this approach, with each test
compound analyzed at least three times. The difference between the actual
carbon number and measured ECN ranged from −24% to −2%. The difference
between theoretical ECN and measured ECN ranged from −22% to 9%.
Measured ECN values were within 10% of theoretical ECN values for most
terpenoid compounds. |
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