Chan, Man Nin and Surratt, Jason D. and Claeys, Magda and Edgerton, Eric S. and Tanner, Roger L. and Shaw, Stephanie L. and Zheng, Mei and Knipping, Eladio M. and Eddingsaas, Nathan C. and Wennberg, Paul O. and Seinfeld, John H. (2010) Characterization and Quantification of Isoprene-Derived Epoxydiols in Ambient Aerosol in the Southeastern United States. Environmental Science and Technology, 44 (12). pp. 4590-4596. ISSN 0013-936X http://resolver.caltech.edu/CaltechAUTHORS:20100706-092745845
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Isoprene-derived epoxydiols (IEPOX) are identified in ambient aerosol samples for the first time, together with other previously identified isoprene tracers (i.e., 2-methyltetrols, 2-methylglyceric acid, C5-alkenetriols, and organosulfate derivatives of 2-methyltetrols). Fine ambient aerosol collected in downtown Atlanta, GA and rural Yorkville, GA during the 2008 August Mini-Intensive Gas and Aerosol Study (AMIGAS) was analyzed using both gas chromatography/quadrupole mass spectrometry (GC/MS) and gas chromatography/time-of-flight mass spectrometry (GC/TOFMS) with prior trimethylsilylation. Mass concentrations of IEPOX ranged from ~1 to 24 ng m^(−3) in the aerosol collected from the two sites. Detection of particle-phase IEPOX in the AMIGAS samples supports recent laboratory results that gas-phase IEPOX produced from the photooxidation of isoprene under low-NO_x conditions is a key precursor of ambient isoprene secondary organic aerosol (SOA) formation. On average, the sum of the mass concentrations of IEPOX and the measured isoprene SOA tracers accounted for about 3% of the organic carbon, demonstrating the significance of isoprene oxidation to the formation of ambient aerosol in this region.
|Additional Information:||© 2010 American Chemical Society. Received February 22, 2010. Revised manuscript received May 2, 2010. Accepted May 4, 2010. Publication Date (Web): May 17, 2010. This work was supported by the Electric Power Research Institute and the Southern Company, Birmingham, AL. We acknowledge all members of the AMIGAS for their support during the field campaign. We thank Arthur W. H. Chan and Christine L. Loza for the generation of the low-NOx isoprene SOA and Kathryn E. Kautzman for assistance with the GC/ TOFMS measurement.|
|Official Citation:||Characterization and Quantification of Isoprene-Derived Epoxydiols in Ambient Aerosol in the Southeastern United States Man Nin Chan, Jason D. Surratt, Magda Claeys, Eric S. Edgerton, Roger L. Tanner, Stephanie L. Shaw, Mei Zheng, Eladio M. Knipping, Nathan C. Eddingsaas, Paul O. Wennberg, John H. Seinfeld Environmental Science & Technology 2010 44 (12), 4590-4596|
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|Deposited By:||Tony Diaz|
|Deposited On:||09 Jul 2010 23:02|
|Last Modified:||26 Dec 2012 12:11|
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