1 research outputs found
Semivolatile Organic Compounds (SOCs) in Fine Particulate Matter (PM<sub>2.5</sub>) during Clear, Fog, and Haze Episodes in Winter in Beijing, China
Few efforts have been made to elucidate
the influence of weather
conditions on the fate of semivolatile organic compounds (SOCs). Here,
daily fine particulate matter (PM<sub>2.5</sub>) during clear, haze,
and fog episodes collected in the winter in Beijing, China was analyzed
for polycyclic aromatic hydrocarbons (PAHs), brominated flame retardants
(BFRs), and organophosphate flame retardants (OPFRs). The total concentrations
of PAHs, OPFRs, and BFRs had medians of 45.1 ng/m<sup>3</sup> and
1347 and 46.7 pg/m<sup>3</sup>, respectively. The temporal pattern
for PAH concentrations was largely dependent on coal combustion for
residential heating. OPFR compositions that change during colder period
were related to enhanced indoor emissions due to heating. The mean
concentrations of SOCs during haze and fog days were 2–10 times
higher than those during clear days. We found that BFRs with lower
octanol and air partition coefficients tended to increase during haze
and fog episodes, be removed from PM<sub>2.5</sub> during clear episodes,
or both. For PAHs and OPFRs, pollutants that are more recalcitrant
to degradation were prone to accumulate during haze and fog days.
The potential source contribution function (PSCF) model indicated
that southern and eastern cities were major source regions of SOCs
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