Heterogeneous reactions of isoprene-derived epoxides: Reaction probabilities and molar secondary organic aerosol yield estimates

Theran P. Riedel, Ying Hsuan Lin, Sri Hapsari Budisulistiorini, Cassandra J. Gaston, Joel A. Thornton, Zhenfa Zhang, William Vizuete, Avram Gold, Jason D. Surratt

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A combination of flow reactor studies and chamber modeling is used to constrain two uncertain parameters central to the formation of secondary organic aerosol (SOA) from isoprene-derived epoxides: (1) the rate of heterogeneous uptake of epoxide to the particle phase and (2) the molar fraction of epoxide reactively taken up that contributes to SOA, the SOA yield (φSOA). Flow reactor measurements of the trans-β-isoprene epoxydiol (trans-β-IEPOX) and methacrylic acid epoxide (MAE) aerosol reaction probability (γ) were performed on atomized aerosols with compositions similar to those used in chamber studies. Observed γ ranges for trans-β-IEPOX and MAE were 6.5 × 10-4-0.021 and 4.9-5.2 × 10-4, respectively. Through the use of a time-dependent chemical box model initialized with chamber conditions and γ measurements, φSOA values for trans-β-IEPOX and MAE on different aerosol compositions were estimated between 0.03-0.21 and 0.07-0.25, respectively, with the MAE φSOA showing more uncertainty.

Original languageEnglish (US)
Pages (from-to)38-42
Number of pages5
JournalEnvironmental Science and Technology Letters
Issue number2
StatePublished - Feb 10 2015


ASJC Scopus subject areas

  • Environmental Chemistry
  • Ecology
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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