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| Titel |
Analysis of the chemical composition of organic aerosol at the Mt. Sonnblick observatory using a novel high mass resolution thermal-desorption proton-transfer-reaction mass-spectrometer (hr-TD-PTR-MS) |
| VerfasserIn |
R. Holzinger, A. Kasper-Giebl, M. Staudinger, G. Schauer, 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. 20 ; Nr. 10, no. 20 (2010-10-27), S.10111-10128 |
| Datensatznummer |
250008857
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| Publikation (Nr.) |
 copernicus.org/acp-10-10111-2010.pdf |
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| Zusammenfassung |
| For the first time a high mass resolution thermal desorption proton transfer
reaction mass spectrometer (hr-TD-PTR-MS) was deployed in the field to
analyze the composition of the organic fraction of aerosols. We report on
measurements from the remote Mt. Sonnblick observatory in the Austrian alps
(3108 m a.s.l.) during a 7 week period in summer 2009. A total of 638 mass
peaks in the range 18–392 Da were detected and quantified in aerosols. An
empirical formula was tentatively attributed to 464 of these compounds by
custom-made data analysis routines which consider compounds containing C, H,
O, N, and S atoms. Most of the other (unidentified) compounds must contain
other elements – most likely halogenated compounds. The mean total
concentration of all detected compounds was 1.1 μg m−3. Oxygenated
hydrocarbons constitute the bulk of the aerosol mass (75%) followed by
organic nitrogen compounds (9%), inorganic compounds (mostly NH3,
8%), unidentified/halogenated (3.8%), hydrocarbons (2.7%), and
organic sulfur compounds (0.8%). The measured O/C ratios are lower than
expected and suggest a significant effect from charring. Organic carbon
concentrations measured with TD-PTR-MS were about 25% lower than
measurements on high volume filter samples. |
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