| Title: | Investigation of the Gas-Phase Photolysis and Temperature-Dependent OH Reaction Kinetics of 4-Hydroxy-2-butanone |
| Author(s): | Bouzidi H; Aslan L; El Dib G; Coddeville P; Fittschen C; Tomas A; |
| Address: | "Mines Douai , Departement SAGE, 59500 Douai, France. Universite de Lille , 59655 Villeneuve d'Ascq, France. Institut de Physique de Rennes (IPR-Rennes), Departement de Physique Moleculaire, UMR 6251 CNRS, 35042 Rennes, France. Universite de Lille, PhysicoChimie des Processus de Combustion et de l'Atmosphere (PC2A) UMR 8522 CNRS/Lille 1, Cite scientifique, 59655 Villeneuve d'Ascq Cedex, France" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "Hydroxyketones are key secondary reaction products in the atmospheric oxidation of volatile organic compounds (VOCs). The fate of these oxygenated VOCs is however poorly understood and scarcely taken into account in atmospheric chemistry modeling. In this work, a combined investigation of the photolysis and temperature-dependent OH radical reaction of 4-hydroxy-2-butanone (4H2B) is presented. The objective was to evaluate the importance of the photolysis process relative to OH oxidation in the atmospheric degradation of 4H2B. A photolysis lifetime of about 26 days was estimated with an effective quantum yield of 0.08. For the first time, the occurrence of a Norrish II mechanism was hypothesized following the observation of acetone among photolysis products. The OH reaction rate coefficient follows the Arrhenius trend (280-358 K) and could be modeled through the following expression: k4H2B(T) = (1.26 +/- 0.40) x 10(-12) x exp((398 +/- 87)/T) in cm(3) molecule(-1) s(-1). An atmospheric lifetime of 2.4 days regarding the OH + 4H2B reaction was evaluated, indicating that OH oxidation is by far the major degradation channel. The present work underlines the need for further studies on the atmospheric fate of oxygenated VOCs" |
| Keywords: | Atmosphere Butanones/*chemistry Gases/*chemistry Hydroxyl Radical/*chemistry Kinetics *Photolysis *Temperature Time Factors; |
| Notes: | "MedlineBouzidi, Hichem Aslan, Lina El Dib, Gisele Coddeville, Patrice Fittschen, Christa Tomas, Alexandre eng Research Support, Non-U.S. Gov't 2015/09/30 Environ Sci Technol. 2015 Oct 20; 49(20):12178-86. doi: 10.1021/acs.est.5b02721. Epub 2015 Oct 7" |
