Predominance of secondary organic aerosol to particle-bound reactive oxygen species activity in fine ambient aerosol
Reactive oxygen species (ROS) are believed to contribute to the adverse health effects of aerosols. This may happen by inhaled particle-bound (exogenic) ROS (PB-ROS) or by ROS formed within the respiratory tract by certain aerosol components (endogenic ROS). We investigated the chemical composition...
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Veröffentlicht in: | Atmospheric chemistry and physics 2019-12, Vol.19 (23), p.14703-14720 |
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Sprache: | eng |
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Zusammenfassung: | Reactive oxygen species (ROS) are believed to contribute
to the adverse health effects of aerosols. This may happen by inhaled
particle-bound (exogenic) ROS (PB-ROS) or by ROS formed within the
respiratory tract by certain aerosol components (endogenic ROS). We
investigated the chemical composition of aerosols and their exogenic ROS
content at the two contrasting locations Beijing (China) and Bern
(Switzerland). We apportioned the ambient organic aerosol to different
sources and attributed the observed water-soluble PB-ROS to them. The
oxygenated organic aerosol (OOA, a proxy for secondary organic aerosol, SOA)
explained the highest fraction of the exogenic ROS concentration variance at
both locations. We also characterized primary and secondary aerosol
emissions generated from different biogenic and anthropogenic sources in
smog chamber experiments. The exogenic PB-ROS content in the OOA from these
emission sources was comparable to that in the ambient measurements. Our
results imply that SOA from gaseous precursors of different anthropogenic
emission sources is a crucial source of water-soluble PB-ROS and should be
additionally considered in toxicological and epidemiological studies in an
adequate way besides primary emissions. The importance of PB-ROS may be
connected to the seasonal trends in health effects of PM reported by
epidemiological studies, with elevated incidences of adverse effects in
warmer seasons, which are accompanied by more-intense atmospheric oxidation
processes. |
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ISSN: | 1680-7324 1680-7316 1680-7324 |
DOI: | 10.5194/acp-19-14703-2019 |