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The kinetics and mechanism of an aqueous phase isoprene reaction with hydroxyl radical

Huang, D.; Zhang, X.; Chen, Z. M.; Zhao, Y.; Shen, X. L.


Aqueous phase chemical processes of organic compounds in the atmosphere have received increasing attention, partly due to their potential contribution to the formation of secondary organic aerosol (SOA). Here, we analyzed the aqueous OH-initiated oxidation of isoprene and its reaction products including carbonyl compounds and organic acids, regarding the acidity and temperature as incloudy conditions. We also performed a laboratory simulation to improve our understanding of the kinetics and mechanisms for the products of aqueous isoprene oxidation that are significant precursors of SOA; these included methacrolein (MACR), methyl vinyl ketone (MVK), methyl glyoxal (MG), and glyoxal (GL). We used a novel chemical titration method to monitor the concentration of isoprene in the aqueous phase. We used a box model to interpret the mechanistic differences between aqueous and gas phase OH radical-initiated isoprene oxidations. Our results were the first demonstration of the rate constant for the reaction between isoprene and OH radical in water, 1.2 (±0.4)×10¹⁰ M¯¹ s¯¹ at 283 K. Molar yields were determined based on consumed isoprene. Of note, the ratio of the yields of MVK (24.1±0.8 %) to MACR (10.9±1.1 %) in the aqueous phase isoprene oxidation was approximately double that observed for the corresponding gas phase reaction. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000088066
Veröffentlicht am 29.11.2018
DOI: 10.5194/acp-11-7399-2011
Zitationen: 50
Web of Science
Zitationen: 50
Zitationen: 58
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Aerosolforschung (IMK-AAF)
Institut für Geographie und Geoökologie (IFGG)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2011
Sprache Englisch
Identifikator ISSN: 1680-7324
KITopen-ID: 1000088066
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 11
Heft 15
Seiten 7399–7415
Vorab online veröffentlicht am 01.08.2011
Nachgewiesen in Scopus
Web of Science
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