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| Titel |
Temperature dependence of the stable carbon isotope composition of gas- and particle phase components of β-pinene ozonolysis |
| VerfasserIn |
Iulia Gensch, Thorsten Hohaus, Harald Saathoff, Beatrix Kammer, Werner Laumer, Bettina Steitz, Robert Wegener, Astrid Kiendler-Scharr |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250038574
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| Zusammenfassung |
| The AIDA SOA09 campaign took place from 2-27 November 2009 in the AIDA aerosol and
cloud simulation chamber of Forschungszentrum Karlsruhe with the goal to investigate
mechanistic aspects of the ozonolysis of α- and β-pinene as well as the partitioning of
semivolatile reaction products. Experiments were conducted in the temperature range
between 243 K and 303 K at atmospheric pressure utilizing cyclohexane as OH scavenger.
During all β-pinene experiments, gas-phase samples were collected in parallel with aerosol
samples to subsequently analyze their stable carbon isotope composition. Compound specific
carbon isotopic analysis was performed with a GC-IRMS system. From the temporal
behaviour of the δ13C of β-pinene a kinetic isotope effect (KIE) of 1.00339 was derived, in
agreement with literature data at 303 K. Furthermore, the KIE was found to intensify
with decreasing temperature. Nopinone, the major oxidation product of β-pinene
was found in both the gas- and particle phase. The temperature dependence of the
isotopic fractionation of nopinone between the phases will be discussed together with
possible applications of the results in atmospheric studies of secondary organic aerosol
formation. |
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