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

Preprint published in 2018 by Changgeng Liu, Yongchun Liu, Tianzeng Chen, Jun Liu, Hong He
This paper is available in a repository.
This paper is available in a repository.

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Preprint: policy unknown
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Postprint: policy unknown
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Published version: policy unknown

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 −11 cm 3 molecule −1 s −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 SO 2 (0–198 ppbv) and NO 2 (0–109 ppbv) 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 NO 2 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.

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