Chemical Characterization of Secondary Organic Aerosol from Oxidation of Isoprene Hydroxyhydroperoxides

Atmospheric oxidation of isoprene under low-NO x conditions leads to the formation of isoprene hydroxyhydroperoxides (ISOPOOH). Subsequent oxidation of ISOPOOH largely produces isoprene epoxydiols (IEPOX), which are known secondary organic aerosol (SOA) precursors. Although SOA from IEPOX has been p...

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Bibliographic Details
Published in:Environmental science & technology 2016-09, Vol.50 (18), p.9889-9899
Main Authors: Riva, Matthieu, Budisulistiorini, Sri H, Chen, Yuzhi, Zhang, Zhenfa, D’Ambro, Emma L, Zhang, Xuan, Gold, Avram, Turpin, Barbara J, Thornton, Joel A, Canagaratna, Manjula R, Surratt, Jason D
Format: Article
Language:English
Subjects:
Aerosols
Atmosphere - chemistry
Atmospheric aerosols
Emissions
Humidity
Laboratories
Mass Spectrometry
Organic chemicals
Oxidation
Oxidation-Reduction
Sulfates - chemistry
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Summary:Atmospheric oxidation of isoprene under low-NO x conditions leads to the formation of isoprene hydroxyhydroperoxides (ISOPOOH). Subsequent oxidation of ISOPOOH largely produces isoprene epoxydiols (IEPOX), which are known secondary organic aerosol (SOA) precursors. Although SOA from IEPOX has been previously examined, systematic studies of SOA characterization through a non-IEPOX route from 1,2-ISOPOOH oxidation are lacking. In the present work, SOA formation from the oxidation of authentic 1,2-ISOPOOH under low-NO x conditions was systematically examined with varying aerosol compositions and relative humidity. High yields of highly oxidized compounds, including multifunctional organosulfates (OSs) and hydroperoxides, were chemically characterized in both laboratory-generated SOA and fine aerosol samples collected from the southeastern U.S. IEPOX-derived SOA constituents were observed in all experiments, but their concentrations were only enhanced in the presence of acidified sulfate aerosol, consistent with prior work. High-resolution aerosol mass spectrometry (HR-AMS) reveals that 1,2-ISOPOOH-derived SOA formed through non-IEPOX routes exhibits a notable mass spectrum with a characteristic fragment ion at m/z 91. This laboratory-generated mass spectrum is strongly correlated with a factor recently resolved by positive matrix factorization (PMF) of aerosol mass spectrometer data collected in areas dominated by isoprene emissions, suggesting that the non-IEPOX pathway could contribute to ambient SOA measured in the Southeastern United States.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.6b02511