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| Titel |
Aqueous chemistry and its role in secondary organic aerosol (SOA) formation |
| VerfasserIn |
Y. B. Lim, Y. Tan, M. J. Perri, S. P. Seitzinger, B. J. Turpin |
| 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. 21 ; Nr. 10, no. 21 (2010-11-10), S.10521-10539 |
| Datensatznummer |
250008881
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| Publikation (Nr.) |
 copernicus.org/acp-10-10521-2010.pdf |
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| Zusammenfassung |
There is a growing understanding that secondary organic aerosol (SOA) can
form through reactions in atmospheric waters (i.e., clouds, fogs, and
aerosol water). In clouds and wet aerosols, water-soluble organic products
of gas-phase photochemistry dissolve into the aqueous phase where they can
react further (e.g., with OH radicals) to form low volatility products that
are largely retained in the particle phase. Organic acids, oligomers and
other products form via radical and non-radical reactions, including
hemiacetal formation during droplet evaporation, acid/base catalysis, and
reaction of organics with other constituents (e.g., NH4+).
This paper provides an overview of SOA formation through aqueous chemistry,
including atmospheric evidence for this process and a review of radical and
non-radical chemistry, using glyoxal as a model precursor. Previously
unreported analyses and new kinetic modeling are reported herein to support
the discussion of radical chemistry. Results suggest that reactions with OH
radicals tend to be faster and form more SOA than non-radical reactions. In
clouds these reactions yield organic acids, whereas in wet aerosols they
yield large multifunctional humic-like substances formed via radical-radical
reactions and their O/C ratios are near 1. |
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