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Type: Artigo de periódico
Title: Mimicking the atmospheric OH-radical-mediated photooxidation of isoprene: formation of cloud-condensation nuclei polyols monitored by electrospray ionization mass spectrometry
Author: Santos, LS
Dalmazio, I
Eberlin, MN
Claeys, M
Augusti, R
Abstract: Recently, it has been proposed (M. Claeys et al., Science 2004; 303: 1173) that the atmospheric OH-radical-mediated photooxidation of isoprene is a source of two major secondary organic aerosol (SOA) components, that is, 2-methylthreitol and 2-methylerythritol. These diastereoisomeric tetrols, which were characterized for the first time in the fine size fraction (< 2.5 mu m aerodynamic diameter) of aerosols collected in the Amazon rain forest during the wet season, were proposed to enhance the capability of the aerosols to act as cloud-condensation nuclei. In the present study, we performed the oxidation of isoprene in aqueous solution under conditions that attempted to mimic atmospheric OH-radical-induced photooxidization, and monitored and characterized on-line the reaction products via electrospray ionization mass (and tandem mass) spectrometry in the negative ion mode. The results show that the reaction of isoprene with photo- or chemically generated hydroxyl radicals indeed yields 2-methyltetrols. Other polyols were also detected, and they may therefore be considered as plausible SOA components eventually formed in normal or more extreme OH-radical-mediated photooxidation of biogenic isoprene. Copyright (c) 2006 John Wiley & Sons, Ltd.
Country: Inglaterra
Editor: John Wiley & Sons Ltd
Citation: Rapid Communications In Mass Spectrometry. John Wiley & Sons Ltd, v. 20, n. 14, n. 2104, n. 2108, 2006.
Rights: fechado
Identifier DOI: 10.1002/rcm.2574
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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