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| Titel |
Isoprene nitrates: preparation, separation, identification, yields, and atmospheric chemistry |
| VerfasserIn |
A. L. Lockwood, P. B. Shepson, M. N. Fiddler, M. Alaghmand |
| 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. 13 ; Nr. 10, no. 13 (2010-07-08), S.6169-6178 |
| Datensatznummer |
250008609
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| Publikation (Nr.) |
 copernicus.org/acp-10-6169-2010.pdf |
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| Zusammenfassung |
| Isoprene is an important atmospheric volatile organic compound involved in
ozone production and NOx (NO+NO2) sequestration and transport.
Isoprene reaction with OH in the presence of NO can form either isoprene
hydroxy nitrates ("isoprene nitrates") or convert NO to NO2 which can
photolyze to form ozone. While it has been shown that isoprene nitrate
production can represent an important sink for NOx in forest impacted
environments, there is little experimental knowledge of the relative
importance of the individual isoprene nitrate isomers, each of which has a
different fate and reactivity. In this work, we have identified the 8
individual isomers and determined their total and individual production
yields. The overall yield of isoprene nitrates at atmospheric pressure and
295 K was found to be 0.070(+0.025/−0.015). Three isomers, representing
nitrates resulting from OH addition to a terminal carbon, represent 90%
of the total IN yield. We also determined the ozone rate constants for three
of the isomers, and have calculated their atmospheric lifetimes, which range
from ~1–2 h, making their oxidation products likely more important
as atmospheric organic nitrates and sinks for nitrogen. |
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