In:
Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 19, No. 3 ( 2019-02-14), p. 2001-2013
Abstract:
Abstract. Methoxyphenols are an important organic component of wood-burning emissions
and considered to be potential precursors of secondary organic aerosol
(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 cm3 molecule−1 s−1,
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 a 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 (0–198 ppbv)
and NO2 (0–109 ppbv) was conducive to increasing SOA yield, for which
the maximum enhancement values were 38.6 % and 19.2 %, 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.
Type of Medium:
Online Resource
ISSN:
1680-7324
DOI:
10.5194/acp-19-2001-2019
DOI:
10.5194/acp-19-2001-2019-supplement
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2019
detail.hit.zdb_id:
2092549-9
detail.hit.zdb_id:
2069847-1
