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| Titel |
Laboratory evidence of organic peroxide and peroxyhemiacetal formation in the aqueous phase and implications for aqueous OH |
| VerfasserIn |
Y. B. Lim, B. J. Turpin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 22 ; Nr. 15, no. 22 (2015-11-19), S.12867-12877 |
| Datensatznummer |
250120172
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| Publikation (Nr.) |
 copernicus.org/acp-15-12867-2015.pdf |
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| Zusammenfassung |
Aqueous chemistry in atmospheric waters (e.g., cloud droplets or wet
aerosols) is considered a potentially important atmospheric pathway to
produce secondary organic aerosol (SOAaq). Water-soluble organic
compounds with small carbon numbers (C2–C3) are precursors for
SOAaq; products include organic acids, organic sulfates, and
high-molecular-weight compounds/oligomers. Fenton reactions and the uptake of
gas-phase OH radicals are considered to be the major oxidant sources for
aqueous organic chemistry. However, the sources and availability of oxidants
in atmospheric waters are not well understood. The degree to which OH is
produced in the aqueous phase affects the balance of radical and non-radical
aqueous chemistry, the properties of the resulting aerosol, and likely its
atmospheric behavior.
This paper demonstrates organic peroxide formation during aqueous
photooxidation of methylglyoxal using ultra-high-resolution Fourier
transform ion cyclotron resonance electrospray ionization mass spectrometry
(FTICR-MS). Organic peroxides are known to form through gas-phase oxidation of
volatile organic compounds. They contribute secondary organic aerosol (SOA)
formation directly by forming peroxyhemiacetals and epoxides (i.e., IEPOX),
and indirectly by enhancing gas-phase oxidation through OH recycling. We
provide simulation results of organic peroxide/peroxyhemiacetal formation in
clouds and wet aerosols and discuss organic peroxides as a source of
condensed-phase OH radicals and as a contributor to aqueous SOA. |
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