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| Titel |
Influence of aerosol acidity on the chemical composition of secondary organic aerosol from β-caryophyllene |
| VerfasserIn |
M. N. Chan, J. D. Surratt, A. W. H. Chan, K. Schilling, J. H. Offenberg, M. Lewandowski, E. O. Edney, T. E. Kleindienst, M. Jaoui, E. S. Edgerton, R. L. Tanner, S. L. Shaw, M. Zheng, E. M. Knipping, J. H. Seinfeld |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 4 ; Nr. 11, no. 4 (2011-02-25), S.1735-1751 |
| Datensatznummer |
250009375
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| Publikation (Nr.) |
 copernicus.org/acp-11-1735-2011.pdf |
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| Zusammenfassung |
| The secondary organic aerosol (SOA) yield of β-caryophyllene
photooxidation is enhanced by aerosol acidity. In the present study, the
influence of aerosol acidity on the chemical composition of
β-caryophyllene SOA is investigated using ultra performance liquid
chromatography/electrospray ionization-time-of-flight mass spectrometry
(UPLC/ESI-TOFMS). A number of first-, second- and higher-generation
gas-phase products having carbonyl and carboxylic acid functional groups are
detected in the particle phase. Particle-phase reaction products formed via
hydration and organosulfate formation processes are also detected. Increased
acidity leads to different effects on the abundance of individual products;
significantly, abundances of organosulfates are correlated with aerosol
acidity. To our knowledge, this is the first detection of organosulfates and
nitrated organosulfates derived from a sesquiterpene. The increase of
certain particle-phase reaction products with increased acidity provides
chemical evidence to support the acid-enhanced SOA yields. Based on the
agreement between the chromatographic retention times and accurate mass
measurements of chamber and field samples, three β-caryophyllene
products (i.e., β-nocaryophyllon aldehyde, β-hydroxynocaryophyllon aldehyde, and β-dihydroxynocaryophyllon
aldehyde) are suggested as chemical tracers for β-caryophyllene SOA.
These compounds are detected in both day and night ambient samples collected
in downtown Atlanta, GA and rural Yorkville, GA during the 2008 August
Mini-Intensive Gas and Aerosol Study (AMIGAS). |
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