References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-12-1881-2012

Study of OH-initiated degradation of 2-aminoethanol

Karl

¹ Dye

¹ Schmidbauer

¹ Wisthaler

² Mikoviny

² D'Anna

³ Müller

³ Borrás

⁴ Clemente

⁴ Muñoz

⁴ Porras

⁴ Ródenas

⁴ Vázquez

⁴ Brauers

⁵

Norwegian Institute for Air Research, NILU, Kjeller, Norway

Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria

IRCELYON, Université Lyon 1, Villeurbanne, France

Instituto Universitario CEAM-UMH – EUPHORE, Paterna – Valencia, Spain

Institut für Energie- und Klimaforschung, IEK-8, Forschungszentrum Jülich, Jülich, Germany

17 02 2012

12 4 1881 1901

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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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