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Title
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Formation of secondary organic aerosol marker compounds from the photooxidation of isoprene and isoprene-derived alkene diols under low- conditions
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Author
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Abstract
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| In the present work, we have evaluated whether isomeric C-5-alkene diols (1,2-dihydroxy-2-methyl-3-butene, 1,2-dihydroxy-3-methyl-3-butene, and 1,4-dihydroxy-2-methyl-2-butene (cis + trans)), which have first been detected upon photooxidation of isoprene in the absence of NO and are known to be formed in the ambient atmosphere, can serve as precursors for the 2-methyltetrols, C-5-alkene triols, and 2-methylglyceric acid under low-NOx conditions. The C-5-alkene diols were prepared following published synthesis procedures. It is shown that under the applied chamber conditions the isomeric C-5-alkene diols give rise to 2-methyltetrols with different threo/erythro abundance ratios and that certain diols produce 2-methylglyceric acid, but that they do not form C-5-alkene triols. Furthermore, it is shown that the photooxidation of isoprene under the applied chamber conditions employing photolysis of H2O2 under dry conditions yields relatively small amounts of C-5-alkene triols compared to those of the 2-methyltetrols, unlike under ambient conditions. It is argued that the chamber conditions are not optimal for the formation of C-5-epoxydiols, which serve as gas-phase precursors for the C-5-alkene triols, and likely as in some previous studies favor the formation of C-5-alkene diols as a result of RO2 + RO2 reactions. |
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Language
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English
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Source (journal)
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Faraday discussions / Royal Society of Chemistry. Faraday Division [Londen] - London
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Publication
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London
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2013
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ISSN
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1359-6640
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DOI
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10.1039/C3FD00092C
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Volume/pages
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165
(2013)
, p. 261-272
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ISI
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000329068600013
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Full text (Publisher's DOI)
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