Title
The acid effect in the formation of 2-methyltetrols from the photooxidation of isoprene in the presence of <tex></tex>$NO_{x}$
Author
Faculty/Department
Faculty of Pharmaceutical, Biomedical and Veterinary Sciences. Pharmacy
Publication type
article
Publication
Clermont-Ferrand ,
Subject
Physics
Chemistry
Pharmacology. Therapy
Source (journal)
Atmospheric research
Atmospheric research / UniversitÚ de Clermont-Ferrand 2. Institut et Observatoire de physique du globe du Puy de D˘me. - Clermont-Ferrand
Volume/pages
98(2010) :2/4 , p. 183-189
ISSN
0169-8095
ISI
000284983400001
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The objectives of this study were to obtain insights into acid effects in the formation of secondary organic aerosol and 2-methyltetrols from the photooxidation of isoprene in the presence of NOx. A photooxidation experiment was performed with isoprene in the presence of NOx where the gaseous reaction mixture was passed over a sulfuric acid-treated and non-treated quartz fibre filter. Consistent with previous laboratory data, the organic carbon and 2-methyltetrol amounts on the sulfuric acid-treated filter were significantly enhanced. In addition, oxygenated isoprene products related to the 2-methyltetrols and formed on the sulfuric acid-treated filter were structurally characterized as enol tautomers of 4-hydroxy-1,3-dioxo-2-methylbutane. No evidence could be found for the formation of C5-epoxydiols in the gas phase but very small amounts, about two orders of magnitude lower than those of the 2-methyltetrols, were generated on the sulfuric acid-treated filter. The formation of the 2-methyltetrols and enol tautomers of 4-hydroxy-1,3-dioxo-2-methylbutane is explained by acid-catalyzed reactions of gas-phase nitrooxypolyols. Implications for the measurement of the 2-methyltetrols using gas chromatography/mass spectrometry (GC/MS) with prior trimethylsilylation are discussed.
E-info
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