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| Titel |
Aerosol analysis using a Thermal-Desorption Proton-Transfer-Reaction Mass Spectrometer (TD-PTR-MS): a new approach to study processing of organic aerosols |
| VerfasserIn |
R. Holzinger, J. Williams, Frank Herrmann, J. Lelieveld  , N. M. Donahue, T. Röckmann |
| 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. 5 ; Nr. 10, no. 5 (2010-03-03), S.2257-2267 |
| Datensatznummer |
250008168
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| Publikation (Nr.) |
 copernicus.org/acp-10-2257-2010.pdf |
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| Zusammenfassung |
| We present a novel analytical approach to measure the chemical composition
of organic aerosol. The new instrument combines proton-transfer-reaction
mass-spectrometry (PTR-MS) with a collection-thermal-desorption aerosol
sampling technique. For secondary organic aerosol produced from the reaction
of ozone with isoprenoids in a laboratory reactor, the TD-PTR-MS instrument
detected typically 80% of the mass that was measured with a scanning
mobility particle sizer (SMPS). The first field deployment of the instrument
was the EUCAARI-IOP campaign at the CESAR tall tower site in the
Netherlands. For masses with low background values (~30% of all
masses) the detection limit of aerosol compounds was below 0.2 ng/m3
which corresponds to a sampled compound mass of 35 pg. Comparison of
thermograms from ambient samples and from chamber-derived secondary organic
aerosol shows that, in general, organic compounds from ambient aerosol
samples desorb at much higher temperatures than chamber samples. This
suggests that chamber aerosol is not a good surrogate for ambient aerosol
and therefore caution is advised when extrapolating results from chamber
experiments to ambient conditions. |
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