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Discussion papers
https://doi.org/10.5194/acp-2018-749
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-749
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 10 Sep 2018

Research article | 10 Sep 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Degradation Kinetics and Secondary Organic Aerosol Formation from Eugenol by Hydroxyl Radicals

Changgeng Liu1,2, Yongchun Liu1,3,4,a, Tianzeng Chen1,4, Jun Liu1,4, and Hong He1,3,4 Changgeng Liu et al.
  • 1State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
  • 2School of Biological and Chemical Engineering, Panzhihua University, Panzhihua 617000, China
  • 3Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
  • 4University of Chinese Academy of Sciences, Beijing 100049, China
  • aCurrently at: Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Abstract. Methoxyphenols are an important organic component of wood-burning emissions and considered to be potential precursors of secondary organic aerosols (SOA). In this work, the rate constant and SOA formation potential for the OH-initiated reaction of 4-allyl-2-methoxyphenol (eugenol) were investigated for the first time in an oxidation flow reactor (OFR). The rate constant was (8.01±0.40) × 10−11cm3 molecule−1s−1 as determined by the relative rate method. The SOA yield first increased and then decreased as a function of OH exposure, and was also dependent on eugenol concentration. The maximum SOA yields (0.11–0.31) obtained at different eugenol concentrations could be expressed well by an one-product model. The carbon oxidation state (OSC) increased linearly and significantly as OH exposure rose, indicating that a high oxidation degree was achieved for SOA. In addition, the presence of SO2 (0–198ppbv) and NO2 (0–109ppbv) was conducive to increasing SOA yield, for which the maximum enhancement values were 38.57% and 19.17%, respectively. The N/C ratio (0.032–0.043) indicated that NO2 participated in the OH-initiated reaction, subsequently forming organic nitrates. The results could be helpful for further understanding the SOA formation potential from the atmospheric oxidation of methoxyphenols and the atmospheric aging process of smoke plumes from biomass-burning emissions.

Changgeng Liu et al.
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Short summary
The rate constant and SOA formation for the OH-initiated reaction of eugenol were studied for the first time in an oxidation flow reactor. The significant SOA formation was observed, and SOA yield depended on precursor concentration and OH exposure. SO2 and NO2 both enhanced SOA yield. In addition, NO2 participated in the OH-initiated reaction and produced organic nitrates. The results could be helpful for further understanding SOA formation from the atmospheric oxidation of methoxyphenols.
The rate constant and SOA formation for the OH-initiated reaction of eugenol were studied for...
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