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Title
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Characterization of polar organosulfates in secondary organic aerosol from the green leaf volatile 3-z-hexenal
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Author
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Abstract
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| Evidence is provided That the green leaf volatiles 3-Z- hexenal serves as a precursor for biogenic secondary organic aersol through the formation of polar organosulfates (Os) with molecular weight (MW) 226. The MW 226 C-6-OSs were Chemically elucidated, along with structurally similar MW 212 C-5-OSs, whose biogenic precursor is likely related to 3-Z-hexenal but still remains unknown. The MW: 226 and 212 OSs have a substantial abundance in ambient fine aerosol from K-puszta, Hungary, which is comparable to that of the isoprene-related MW 216 OSs, known to be formed: through sulfation of C-5-epoxydiols, second-generation gas-phase photooxidation products of isoprene. Using detailed interpretation of negative-ion electrospray ionization mass spectral data, the MW 226, compounds are assigned to isomeric sulfate esters of 3,4-dihydroxyhex-5-enoic acid with the sulfate group located or C-4 position. Two MW 212 compounds present in: ambient fine aerosol are attributed to isomeric sulfate :esters of 2,3-dihydroxypent-4-enoic acid, of which two are sulfated at C-3 and one is sulfated at C-2. The formation of the MW 226 :OSs is tentatively explained through photooxidation of 3-Z-hexenal in, the gas phase, resulting in alkoxy radical, followed by a rearrangement and subsequent sulfation of the epoxy group in the particle phase. |
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Language
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English
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Source (journal)
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Environmental science and technology / American Chemical Society. - Easton, Pa
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Publication
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Easton, Pa
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2014
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ISSN
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0013-936X
[print]
1520-5851
[online]
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DOI
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10.1021/ES503226B
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Volume/pages
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48
:21
(2014)
, p. 12671-12678
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ISI
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000344449100024
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Pubmed ID
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25271849
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Full text (Publisher's DOI)
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