Journal Article

PreJuSER-20324

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Study of OH-initiated degradation of 2-aminoethanol

Karl, M. ; Dye, C. ; Schmidbauer, N. ; Wisthaler, A. ; Mikoviny, T. ; D'Anna, B. ; Müller, M. ; Borrás, E. ; Clemente, E. ; Munoz, A. ; Porras, R. ; Ródenas, M. ; Vázquez, M. ; Brauers, T.FZJ*

2012
EGU Katlenburg-Lindau

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Please use a persistent id in citations: http://hdl.handle.net/2128/7438  doi:10.5194/acp-12-1881-2012

Abstract: 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) x 10(-11) cm(3) 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.

Keyword(s): J

Note: The Instituto Universitario CEAM-UMH is partly supported by Generalitat Valenciana, Fundacion Bancaja, and the projects GRACCIE (Consolider-Ingenio 2010) and FEEDBACKS (Prometeo - Generalitat Valenciana). The EUPHORE team is acknowledged for their support in the use of the facilities. Armin Wisthaler and Tomas Mikoviny acknowledge support from A. Hansel and T. D. Mark. Claus Nielsen is thanked for the preparation of the reference salt, ethanolaminium nitrate, for the AMS analysis. Eldbjorg S. Heimstad and Mikael Harju (NILU Tromso) are thanked for determination of rate constants of several products from OH-initiated oxidation of MEA using EPI Suite version 4.0.

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Contributing Institute(s):

1. Troposphäre (IEK-8)

Research Program(s):

1. Atmosphäre und Klima (P23)

Appears in the scientific report 2012

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Database coverage:
; ; ; ; Current Contents - Social and Behavioral Sciences ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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