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| Titel |
Gas phase precursors to anthropogenic secondary organic aerosol: detailed observations of 1,3,5-trimethylbenzene photooxidation |
| VerfasserIn |
K. P. Wyche, P. S. Monks, A. M. Ellis, R. L. Cordell, A. E. Parker, C. Whyte, A. Metzger, J. Dommen, J. Duplissy, A. S. H. Prévôt, U. Baltensperger, A. R. Rickard, F. Wulfert |
| 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 ; 9, no. 2 ; Nr. 9, no. 2 (2009-01-27), S.635-665 |
| Datensatznummer |
250006747
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| Publikation (Nr.) |
 copernicus.org/acp-9-635-2009.pdf |
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| Zusammenfassung |
| A series of photooxidation experiments were conducted in an atmospheric
simulation chamber in order to investigate the oxidation mechanism and
secondary organic aerosol (SOA) formation potential of the model
anthropogenic gas phase precursor, 1,3,5-trimethylbenzene. Alongside
specific aerosol measurements, comprehensive gas phase measurements,
primarily by Chemical Ionisation Reaction Time-of-Flight Mass Spectrometry
(CIR-TOF-MS), were carried out to provide detailed insight into the
composition and behaviour of the organic components of the gas phase matrix
during SOA formation. An array of gas phase organic compounds was measured
during the oxidation process, including several previously unmeasured
primary bicyclic compounds possessing various functional groups. Analysis of
results obtained during this study implies that these peroxide bicyclic
species along with a series of ring opening products and organic acids
contribute to SOA growth. The effect of varying the VOC/NOx ratio on
SOA formation was explored, as was the effect of acid seeding. It was found
that low NOx conditions favour more rapid aerosol formation and a
higher aerosol yield, a result that implies a role for organic peroxides in
the nucleation process and SOA growth. |
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