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Reactive intermediates revealed in secondary organic aerosol formation from isoprene.
Proc Natl Acad Sci U S A. 2010 Apr 13; 107(15):6640-5.PN

Abstract

Isoprene is a significant source of atmospheric organic aerosol; however, the oxidation pathways that lead to secondary organic aerosol (SOA) have remained elusive. Here, we identify the role of two key reactive intermediates, epoxydiols of isoprene (IEPOX = beta-IEPOX + delta-IEPOX) and methacryloylperoxynitrate (MPAN), which are formed during isoprene oxidation under low- and high-NO(x) conditions, respectively. Isoprene low-NO(x) SOA is enhanced in the presence of acidified sulfate seed aerosol (mass yield 28.6%) over that in the presence of neutral aerosol (mass yield 1.3%). Increased uptake of IEPOX by acid-catalyzed particle-phase reactions is shown to explain this enhancement. Under high-NO(x) conditions, isoprene SOA formation occurs through oxidation of its second-generation product, MPAN. The similarity of the composition of SOA formed from the photooxidation of MPAN to that formed from isoprene and methacrolein demonstrates the role of MPAN in the formation of isoprene high-NO(x) SOA. Reactions of IEPOX and MPAN in the presence of anthropogenic pollutants (i.e., acidic aerosol produced from the oxidation of SO(2) and NO(2), respectively) could be a substantial source of "missing urban SOA" not included in current atmospheric models.

Authors+Show Affiliations

Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

20080572

Citation

Surratt, Jason D., et al. "Reactive Intermediates Revealed in Secondary Organic Aerosol Formation From Isoprene." Proceedings of the National Academy of Sciences of the United States of America, vol. 107, no. 15, 2010, pp. 6640-5.
Surratt JD, Chan AW, Eddingsaas NC, et al. Reactive intermediates revealed in secondary organic aerosol formation from isoprene. Proc Natl Acad Sci U S A. 2010;107(15):6640-5.
Surratt, J. D., Chan, A. W., Eddingsaas, N. C., Chan, M., Loza, C. L., Kwan, A. J., Hersey, S. P., Flagan, R. C., Wennberg, P. O., & Seinfeld, J. H. (2010). Reactive intermediates revealed in secondary organic aerosol formation from isoprene. Proceedings of the National Academy of Sciences of the United States of America, 107(15), 6640-5. https://doi.org/10.1073/pnas.0911114107
Surratt JD, et al. Reactive Intermediates Revealed in Secondary Organic Aerosol Formation From Isoprene. Proc Natl Acad Sci U S A. 2010 Apr 13;107(15):6640-5. PubMed PMID: 20080572.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Reactive intermediates revealed in secondary organic aerosol formation from isoprene. AU - Surratt,Jason D, AU - Chan,Arthur W H, AU - Eddingsaas,Nathan C, AU - Chan,ManNin, AU - Loza,Christine L, AU - Kwan,Alan J, AU - Hersey,Scott P, AU - Flagan,Richard C, AU - Wennberg,Paul O, AU - Seinfeld,John H, Y1 - 2009/12/31/ PY - 2010/1/19/entrez PY - 2010/1/19/pubmed PY - 2010/5/15/medline SP - 6640 EP - 5 JF - Proceedings of the National Academy of Sciences of the United States of America JO - Proc Natl Acad Sci U S A VL - 107 IS - 15 N2 - Isoprene is a significant source of atmospheric organic aerosol; however, the oxidation pathways that lead to secondary organic aerosol (SOA) have remained elusive. Here, we identify the role of two key reactive intermediates, epoxydiols of isoprene (IEPOX = beta-IEPOX + delta-IEPOX) and methacryloylperoxynitrate (MPAN), which are formed during isoprene oxidation under low- and high-NO(x) conditions, respectively. Isoprene low-NO(x) SOA is enhanced in the presence of acidified sulfate seed aerosol (mass yield 28.6%) over that in the presence of neutral aerosol (mass yield 1.3%). Increased uptake of IEPOX by acid-catalyzed particle-phase reactions is shown to explain this enhancement. Under high-NO(x) conditions, isoprene SOA formation occurs through oxidation of its second-generation product, MPAN. The similarity of the composition of SOA formed from the photooxidation of MPAN to that formed from isoprene and methacrolein demonstrates the role of MPAN in the formation of isoprene high-NO(x) SOA. Reactions of IEPOX and MPAN in the presence of anthropogenic pollutants (i.e., acidic aerosol produced from the oxidation of SO(2) and NO(2), respectively) could be a substantial source of "missing urban SOA" not included in current atmospheric models. SN - 1091-6490 UR - https://www.unboundmedicine.com/medline/citation/20080572/Reactive_intermediates_revealed_in_secondary_organic_aerosol_formation_from_isoprene_ L2 - http://www.pnas.org/cgi/pmidlookup?view=long&pmid=20080572 DB - PRIME DP - Unbound Medicine ER -