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| Titel |
Study of OH-initiated degradation of 2-aminoethanol |
| VerfasserIn |
M. Karl, C. Dye, N. Schmidbauer, A. Wisthaler, T. Mikoviny, B. D'Anna, M. Müller, E. Borrás, E. Clemente, A. Muñoz, R. Porras, M. Ródenas, M. Vázquez, T. Brauers |
| 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 ; 12, no. 4 ; Nr. 12, no. 4 (2012-02-17), S.1881-1901 |
| Datensatznummer |
250010730
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| Publikation (Nr.) |
 copernicus.org/acp-12-1881-2012.pdf |
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| Zusammenfassung |
| The degradation of 2-aminoethanol (MEA) by the hydroxyl radical (OH)
was studied in the European Photoreactor (EUPHORE), a large outdoor
environmental chamber. High-Temperature Proton-Transfer-Reaction
Mass Spectrometry (HT-PTR-MS) and Fast Fourier Transform Infrared
(FT-IR) were used to follow concentrations of reactants in the gas
phase. Aerosol mass concentrations were tracked with Aerosol Mass
Spectrometry (AMS). The chamber aerosol model MAFOR was applied to
quantify losses of MEA to the particle phase. The rate constant
k(OH + MEA) was determined relative to the rate constant of the
1,3,5-trimethylbenzene reaction with OH and was found to be
(9.2 ± 1.1) × 10−11 cm3 molecule−1 s−1, and thus
the reaction between OH radicals and MEA proceeds a factor of 2–3
faster than estimated by structure-activity relationship (SAR) methods.
Main uncertainty of the relative rate determination is the unknown
temporal behaviour of the loss rate of MEA to chamber wall surfaces
during the sunlit experiments. Nucleation and growth of particles observed
in the experiments could be reproduced by the chamber model that accounted
for condensation of gaseous oxidation products, condensation of
ethanolaminium nitrate and nucleation involving MEA and nitric acid. |
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