| Photolysis and heterogeneous reaction of coniferyl aldehyde adsorbed on silica particles with ozone. | |
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MedLine Citation:
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PMID: 21117122 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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The pseudo-first-order loss of coniferyl aldehyde, adsorbed on silicon dioxide particles, upon heterogeneous ozonolysis was monitored at various ozone mixing ratios in the absence and presence of simulated sunlight. For the first time we investigated the effect of light on the heterogeneous ozonolysis of coniferyl aldehyde adsorbed on silica particles. We found that UV-VIS light (λ>300 nm) does not impact the degradation of coniferyl aldehyde by ozone but induces an additional, slow photolysis of the aldehyde with a photolytic rate constant of ∼10(-5) s(-1). In both cases, that is, in presence and/or absence of light, the heterogeneous ozonation kinetics are well described by an immediate gas-surface reaction formalism with light-independent rate constants of k(2nd)=(7.2±0.9)×10(-19) cm(3) molec(-1) s(-1) and (7.6±1.7)×10(-19) cm(3) molec(-1) s(-1) in the absence and presence of light, respectively. Five oxidation products: glycolic acid, oxalic acid, vanillin, vanillic acid and 3,4-dihydroxybenzoic acid were identified and confirmed by their corresponding standards. Vanillin and vanillic acid absorb light in the region λ>300 nm and thus can further participate in the direct and indirect photolysis processes of atmospheric relevance. A reaction mechanism is proposed in order to elucidate the ozonolysis reaction and to explain the reaction products. |
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Authors:
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Sopheak Net; Elena Gomez Alvarez; Natalja Balzer; Henri Wortham; Cornelius Zetzsch; Sasho Gligorovski |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Chemphyschem : a European journal of chemical physics and physical chemistry Volume: 11 ISSN: 1439-7641 ISO Abbreviation: Chemphyschem Publication Date: 2010 Dec |
Date Detail:
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Created Date: 2010-12-14 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100954211 Medline TA: Chemphyschem Country: Germany |
Other Details:
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Languages: eng Pagination: 4019-27 Citation Subset: IM |
Affiliation:
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Université d'Aix-Marseille I, II, III-CNRS, UMR 6264 : Laboratoire Chimie Provence, Equipe Instrumentation et Réactivité Atmosphérique, Case courrier 29, 3 place Victor Hugo, 13331 Marseille Cedex 3 (France), Fax:(+33) 413551060. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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