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Characterization of polar organosulfates in secondary organic aerosol from the green leaf volatile 3-Z-hexenal
Citation:
Shalamzari, M., A. Kahnt, R. Vermeylen, Tad Kleindienst, M. Lewandowski, F. Cuyckens, W. Maenhaut, AND M. Claeys. Characterization of polar organosulfates in secondary organic aerosol from the green leaf volatile 3-Z-hexenal. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 48(21):12671-12678, (2014).
Impact/Purpose:
The National Exposure Research Laboratory’s (NERL’s) Human Exposure and Atmospheric Sciences Division (HEASD) conducts research in support of EPA’s mission to protect human health and the environment. HEASD’s research program supports Goal 1 (Clean Air) and Goal 4 (Healthy People) of EPA’s strategic plan. More specifically, our division conducts research to characterize the movement of pollutants from the source to contact with humans. Our multidisciplinary research program produces Methods, Measurements, and Models to identify relationships between and characterize processes that link source emissions, environmental concentrations, human exposures, and target-tissue dose. The impact of these tools is improved regulatory programs and policies for EPA.
Description:
Evidence is provided that the green leaf volatile 3-Z-hexenal serves as a precursor for biogenic secondary organic aerosol through formation of polar organosulfates (OSs) with molecular weights (MW) 226 and 214. The MW 226 C6-OSs and MW 214 C5M-OSs were chemically elucidated, along with structurally similar MW 212 C5-OS, whose biogenic precursor is likely related to 3-Z-hexenal but still remains unknown. The MW 226, 214 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 C5-epoxydiols. Using detailed interpretation of negative ion electrospray ionization mass spectral data, the MW 226 and 214 compounds are assigned to sulfate esters of 3,4-dihydroxyhex-5-enoic acid and 3,4-dihydroxypentanoic acid, respectively. One of the four MW 212 compounds present in ambient fine aerosol is attributed to a sulfate ester of 2,3-dihydroxypent-4-enoic acid. The formation of the MW 226 OSs is tentatively explained through photooxidation of 3-Z-hexenal in the gas phase resulting in an alkoxy radical, followed by a rearrangement, and subsequent sulfation of the epoxy group in the particle phase.
URLs/Downloads:
MSS_SOA_HEXENAL_REVISED FINAL FINAL.PDF (PDF, NA pp, 757.698 KB, about PDF)Environmental Science & Technology
