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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2017-342
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
09 May 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Secondary organic aerosol from chlorine-initiated oxidation of isoprene
Dongyu S. Wang and Lea Hildebrandt Ruiz McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, TX 78756, USA
Abstract. Recent studies have found inland concentrations of reactive chlorine species to be higher than expected, suggesting that atmospheric chlorine chemistry is more extensive than previously thought. Chlorine radicals can interact with HOx radicals and nitrogen oxides (NOx) to alter the oxidative capacity of the atmosphere. They are known to rapidly oxidize a wide range of volatile organic compounds (VOC) found in the atmosphere, yet little is known about secondary organic aerosol (SOA) formation from chlorine-initiated photo-oxidation and its atmospheric implications. Environmental chamber experiments were carried out under low-NOx conditions with isoprene and chlorine as primary VOC and oxidant sources. Upon complete isoprene consumption, observed SOA yields ranged from 8 % to 36 %, decreasing with extended photo-oxidation and SOA aging. A High-Resolution Time-of-Flight Chemical Ionization Mass Spectrometer was used to determine the molecular composition of gas-phase species using iodide-water and hydronium-water ionization. Ions consistent with isoprene-derived epoxydiol (IEPOX) and other common OH-isoprene oxidation products were observed, evident of secondary OH production and resulting chemistry from Cl-initiated reactions.

Citation: Wang, D. S. and Hildebrandt Ruiz, L.: Secondary organic aerosol from chlorine-initiated oxidation of isoprene, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-342, in review, 2017.
Dongyu S. Wang and Lea Hildebrandt Ruiz
Dongyu S. Wang and Lea Hildebrandt Ruiz
Dongyu S. Wang and Lea Hildebrandt Ruiz

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Short summary
We investigated the formation of atmospheric pollutants from chlorine-initiated oxidation of isoprene. Our study is the first to report formation of airborne particles from these reactions. We analyzed the chemical composition of both gas- and particle-phase products, and propose methods to better detect particle-phase pollutants. Overall, our study demonstrates that reactions between isoprene and chlorine can have important implications to atmospheric composition and therefore human health.
We investigated the formation of atmospheric pollutants from chlorine-initiated oxidation of...
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