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Atmospheric Oxidation of 1,3-Butadiene: Characterization of gas and aerosol reaction products and implication for PM2.5
Citation:
Jaoui, M., M. Lewandowski, K. Docherty, J. Offenberg, AND Tad Kleindienst. Atmospheric Oxidation of 1,3-Butadiene: Characterization of gas and aerosol reaction products and implication for PM2.5. Atmospheric Chemistry and Physics. Copernicus Publications, Katlenburg-Lindau, Germany, 14(24):13681-13704, (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:
Secondary organic aerosol (SOA) was generated by irradiating 1,3-butadiene (13BD) in the presence of H2O2 or NOx. Experiments were conducted in a smog chamber operated in either flow or batch mode. A filter/denuder sampling system was used for simultaneously collecting gas and particle-phase products. The chemical composition of the gas phase and SOA was analyzed using derivative-based methods (BSTFA, BSTFA C PFBHA, or DNPH)followed by gas chromatography–mass spectrometry (GC–MS) or high-performance liquid chromatography (HPLC)analysis of the derivative compounds. The analysis showed the occurrence of more than 60 oxygenated organic compoundsin the gas and particle phases, of which 31 organic monomers were tentatively identified. The major identified products include glyceric acid, d-threitol, erythritol, d-threonic acid, meso-threonic acid, erythrose, malic acid, tartaricacid, and carbonyls including glycolaldehyde, glyoxal, acrolein, malonaldehyde, glyceraldehyde, and peroxyacryloyl nitrate (APAN). Some of these were detected in ambient PM2:5 samples, and could potentially serve as organic markers of 13BD. Furthermore, a series of oligoesters were detected and found to be produced through chemical reactions occurring in the aerosol phase between compounds bearing alcoholic groups and compounds bearing acidic groups.
URLs/Downloads:
ACP-2014-323-MANUSCRIPT-VERSION3 FINAL FINAL.PDF (PDF, NA pp, 657.373 KB, about PDF)Atmospheric Chemistry and Physics
