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Light-absorbing oligomer formation in secondary organic aerosol from reactive uptake of isoprene epoxydiols.
Environ Sci Technol. 2014 Oct 21; 48(20):12012-21.ES

Abstract

Secondary organic aerosol (SOA) produced from reactive uptake and multiphase chemistry of isoprene epoxydiols (IEPOX) has been found to contribute substantially (upward of 33%) to the fine organic aerosol mass over the Southeastern U.S. Brown carbon (BrC) in rural areas of this region has been linked to secondary sources in the summer when the influence of biomass burning is low. We demonstrate the formation of light-absorbing (290 < λ < 700 nm) SOA constituents from reactive uptake of trans-β-IEPOX onto preexisting sulfate aerosols as a potential source of secondary BrC. IEPOX-derived BrC generated in controlled chamber experiments under dry, acidic conditions has an average mass absorption coefficient of ∼ 300 cm(2) g(-1). Chemical analyses of SOA constituents using UV-visible spectroscopy and high-resolution mass spectrometry indicate the presence of highly unsaturated oligomeric species with molecular weights separated by mass units of 100 (C5H8O2) and 82 (C5H6O) coincident with the observations of enhanced light absorption, suggesting such oligomers as chromophores, and potentially explaining one source of humic-like substances (HULIS) ubiquitously present in atmospheric aerosol. Similar light-absorbing oligomers were identified in fine aerosol collected in the rural Southeastern U.S., supporting their atmospheric relevance and revealing a previously unrecognized source of oligomers derived from isoprene that contributes to ambient fine aerosol mass.

Authors+Show Affiliations

Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States.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

25226366

Citation

Lin, Ying-Hsuan, et al. "Light-absorbing Oligomer Formation in Secondary Organic Aerosol From Reactive Uptake of Isoprene Epoxydiols." Environmental Science & Technology, vol. 48, no. 20, 2014, pp. 12012-21.
Lin YH, Budisulistiorini SH, Chu K, et al. Light-absorbing oligomer formation in secondary organic aerosol from reactive uptake of isoprene epoxydiols. Environ Sci Technol. 2014;48(20):12012-21.
Lin, Y. H., Budisulistiorini, S. H., Chu, K., Siejack, R. A., Zhang, H., Riva, M., Zhang, Z., Gold, A., Kautzman, K. E., & Surratt, J. D. (2014). Light-absorbing oligomer formation in secondary organic aerosol from reactive uptake of isoprene epoxydiols. Environmental Science & Technology, 48(20), 12012-21. https://doi.org/10.1021/es503142b
Lin YH, et al. Light-absorbing Oligomer Formation in Secondary Organic Aerosol From Reactive Uptake of Isoprene Epoxydiols. Environ Sci Technol. 2014 Oct 21;48(20):12012-21. PubMed PMID: 25226366.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Light-absorbing oligomer formation in secondary organic aerosol from reactive uptake of isoprene epoxydiols. AU - Lin,Ying-Hsuan, AU - Budisulistiorini,Sri Hapsari, AU - Chu,Kevin, AU - Siejack,Richard A, AU - Zhang,Haofei, AU - Riva,Matthieu, AU - Zhang,Zhenfa, AU - Gold,Avram, AU - Kautzman,Kathryn E, AU - Surratt,Jason D, Y1 - 2014/10/06/ PY - 2014/9/17/entrez PY - 2014/9/17/pubmed PY - 2015/12/15/medline SP - 12012 EP - 21 JF - Environmental science & technology JO - Environ Sci Technol VL - 48 IS - 20 N2 - Secondary organic aerosol (SOA) produced from reactive uptake and multiphase chemistry of isoprene epoxydiols (IEPOX) has been found to contribute substantially (upward of 33%) to the fine organic aerosol mass over the Southeastern U.S. Brown carbon (BrC) in rural areas of this region has been linked to secondary sources in the summer when the influence of biomass burning is low. We demonstrate the formation of light-absorbing (290 < λ < 700 nm) SOA constituents from reactive uptake of trans-β-IEPOX onto preexisting sulfate aerosols as a potential source of secondary BrC. IEPOX-derived BrC generated in controlled chamber experiments under dry, acidic conditions has an average mass absorption coefficient of ∼ 300 cm(2) g(-1). Chemical analyses of SOA constituents using UV-visible spectroscopy and high-resolution mass spectrometry indicate the presence of highly unsaturated oligomeric species with molecular weights separated by mass units of 100 (C5H8O2) and 82 (C5H6O) coincident with the observations of enhanced light absorption, suggesting such oligomers as chromophores, and potentially explaining one source of humic-like substances (HULIS) ubiquitously present in atmospheric aerosol. Similar light-absorbing oligomers were identified in fine aerosol collected in the rural Southeastern U.S., supporting their atmospheric relevance and revealing a previously unrecognized source of oligomers derived from isoprene that contributes to ambient fine aerosol mass. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/25226366/Light_absorbing_oligomer_formation_in_secondary_organic_aerosol_from_reactive_uptake_of_isoprene_epoxydiols_ L2 - https://doi.org/10.1021/es503142b DB - PRIME DP - Unbound Medicine ER -