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| Titel |
Organosulfate formation during the reactive uptake of monoterpene oxides on acidic seed particle |
| VerfasserIn |
Y. Iinuma, O. Böge, A. Kahnt, H. Herrmann |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250023771
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| Zusammenfassung |
| It is well recognized that secondary organic aerosol (SOA) plays an important role in the
climate and regional air quality. Monoterpenes react rapidly with atmospheric oxidants (O3,
OH and NO3 radicals) in the gas-phase to form low volatile compounds that condense onto
the pre-existing particles. Very recently, laboratory studies have demonstrated occurrence of
organosulfates in SOA from the oxidation of monoterpenes and isoprene, and the reactive
uptake of pinonaldehyde and glyoxal in the presence of acidic sulphate aerosol (either from
seed aerosol or SO2 photooxidation). Field evidence for the existence of organosulfates and
nitrooxy-organosulfates originating from isoprene, α- and β-pinenes in ambient SOA are
presented from field campaigns conducted in various parts of the world. These
studies demonstrated that the organosulfates may contribute substantially to ambient
SOA.
In the present study, the reactive uptake of monoterpene oxide on acidic sulfate aerosol
was performed in a series of aerosol chamber experiments. Off-line analysis was performed
using HPLC/ESI-TOFMS (electrospray ionization time-of-flight mass spectrometry).
Organosulfates which were tentatively quantified in our previous study are quantified using a
reference compound. In addition, evidence is provided for the isomerisation of monoterpene
oxides over acidic sulphate aerosol. |
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