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| Titel |
Formation of gas-phase carbonyls from heterogeneous oxidation of polyunsaturated fatty acids at the air–water interface and of the sea surface microlayer |
| VerfasserIn |
S. Zhou, L. Gonzalez, A. Leithead, Z. Finewax, R. Thalman, A. Vlasenko, S. Vagle, L. A. Miller, S.-M. Li, S. Bureekul, H. Furutani, M. Uematsu, R. Volkamer, J. Abbatt |
| 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 ; 14, no. 3 ; Nr. 14, no. 3 (2014-02-05), S.1371-1384 |
| Datensatznummer |
250118357
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| Publikation (Nr.) |
 copernicus.org/acp-14-1371-2014.pdf |
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| Zusammenfassung |
| Motivated by the potential for reactive heterogeneous chemistry occurring at
the ocean surface, gas-phase products were observed when a reactive sea
surface microlayer (SML) component, i.e. the polyunsaturated fatty acids
(PUFA) linoleic acid (LA), was exposed to gas-phase ozone at the
air–seawater interface. Similar oxidation experiments were conducted with
SML samples collected from two different oceanic locations, in the eastern
equatorial Pacific Ocean and from the west coast of Canada. Online
proton-transfer-reaction mass spectrometry (PTR-MS) University of Colorado
light-emitting diode cavity-enhanced differential optical absorption
spectroscopy (LED-CE-DOAS) were used to detect oxygenated gas-phase products
from the ozonolysis reactions. The LA studies indicate that oxidation of a
PUFA monolayer on seawater gives rise to prompt and efficient formation of
gas-phase aldehydes. The products are formed via the decomposition of primary
ozonides which form upon the initial reaction of ozone with the
carbon–carbon double bonds in the PUFA molecules. In addition, two highly
reactive dicarbonyls, malondialdehyde (MDA) and glyoxal, were also generated,
likely as secondary products. Specific yields relative to reactant loss were
78%, 29%, 4% and < 1% for n-hexanal, 3-nonenal, MDA and
glyoxal, respectively, where the yields for MDA and glyoxal are likely lower
limits. Heterogeneous oxidation of SML samples confirm for the first time
that similar carbonyl products are formed via ozonolysis of environmental
samples. |
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