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| Titel |
The potential contribution of organic salts to new particle growth |
| VerfasserIn |
K. C. Barsanti, P. H. McMurry, J. N. Smith |
| 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. 9 ; Nr. 9, no. 9 (2009-05-06), S.2949-2957 |
| Datensatznummer |
250007264
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| Publikation (Nr.) |
 copernicus.org/acp-9-2949-2009.pdf |
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| Zusammenfassung |
| Field and lab measurements suggest that low-molecular weight (MW) organic
acids and bases exist in accumulation and nucleation mode particles, despite
their relatively high pure-liquid vapor pressures. The mechanism(s) by which
such compounds contribute to the mass growth of existing aerosol particles
and newly formed particles has not been thoroughly explored. One mechanism
by which low-MW compounds may contribute to new particle growth is through
the formation of organic salts. In this paper we use thermodynamic modeling
to explore the potential for organic salt formation by atmospherically
relevant organic acids and bases for two system types: one in which the
relative contribution of ammonia vs. amines in forming organic salts was
evaluated, the other in which the decrease in volatility of organic acids
and bases due to organic salt formation was assessed. The modeling approach
employed relied heavily on group contribution and other estimation methods
for necessary physical and chemical parameters. The results of this work
suggest that amines may be an important contributor to organic salt
formation, and that experimental data are greatly needed to improve our
understanding of organic salt formation in atmospherically relevant systems
and to accurately predict the potential contribution of such salts to new
particle growth. |
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