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| Titel |
Temperature effect on physical and chemical properties of secondary organic aerosol from m-xylene photooxidation |
| VerfasserIn |
L. Qi, S. Nakao, P. Tang, D. R. Cocker |
| 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 ; 10, no. 8 ; Nr. 10, no. 8 (2010-04-26), S.3847-3854 |
| Datensatznummer |
250008376
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| Publikation (Nr.) |
 copernicus.org/acp-10-3847-2010.pdf |
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| Zusammenfassung |
| The chemical and physical differences of
secondary organic aerosol (SOA) formed at select isothermal temperatures
(278 K, 300 K, and 313 K) are explored with respect to density, particle
volatility, particle hygroscopicity, and elemental chemical composition. A
transition point in SOA density, volatility, hygroscopicity and elemental
composition is observed near 290–292 K as SOA within an environmental
chamber is heated from 278 K to 313 K, indicating the presence of a
thermally labile compound. No such transition points are observed for SOA
produced at 313 K or 300 K and subsequently cooled to 278 K. The SOA formed
at the lowest temperatures (278 K) is more than double the SOA formed at 313
K. SOA formed at 278 K is less hydrophilic and oxygenated while more
volatile and dense than SOA formed at 300 K or 313 K. The properties of SOA
formed at 300 K and 313 K when reduced to 278 K did not match the properties
of SOA initially formed at 278 K. This study demonstrates that it is
insufficient to utilize the enthalpy of vaporization when predicting SOA
temperature dependence. |
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