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| Titel |
Experimental determination of partition coefficient for β-pinene ozonolysis products in SOA |
| VerfasserIn |
Iulia Gensch, Thorsten Hohaus, Joel Kimmel, John T. Jayne, Douglas R. Worsnop, Astrid Kiendler-Scharr |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250077000
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| Zusammenfassung |
| In the present study, simultaneous measurement of β-pinene ozonolysis products in
the gas phase by Proton Transfer Reaction – Time of Flight Mass Spectrometry
(PTR-ToFMS) and particle phase by using an Aerosol Collection Module coupled to
a Gas Chromatograph - Mass Spectrometer (ACM-GC-MS) were employed to
determine the equilibrium partitioning coefficient (Kp) of several semi-volatile organic
species. Mean Kp values of 6.7 10-5 ± 2.5 10-5 for nopinone, 4.8 10-4 ± 1.7
10-4 for apoverbenone, 7.0 10-4 ± 1.7 10-4 for oxonopinone and 1.9 10-3 ±
1.1 10-3 for hydroxynopinone were obtained. The results were compared with
calculations arising from studies on the gas-particle partitioning, based on the Pankow
absorption model. The experimental partition coefficients are two to three orders of
magnitudes higher than the calculated values, leading to the conclusion that the amount of
semi-volatile organic compounds in secondary organic aerosol (SOA) is currently
underestimated by the theory, thus impacting on the modeling of the organic matter in the
atmosphere. |
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