Measurement report: Atmospheric aging of combustion-derived particles – impact on stable free radical concentration and its ability to produce reactive oxygen species in aqueous media
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Published:2023-06-30
Issue:12
Volume:23
Page:7213-7223
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Runberg Heather L.ORCID, Majestic Brian J.
Abstract
Abstract. Environmentally persistent free radicals (EPFRs) are a
pollutant found on fine atmospheric particulate matter (PM2.5),
particularly on PM2.5 formed from combustion processes. EPFRs are
organic radicals that can endure in the environment for days to years.
Interest in the toxicity of EPFRs has increased significantly in recent
years, as it has been shown to have substantial ability to form reactive
oxygen species (ROS), but little is known about how its characteristics
change as PM2.5 ages in the atmosphere. Here, we exposed newly produced
hexane-generated soot to simulated sunlight for 24 h. Changes to the
EPFR characteristics of the particles were measured by electron paramagnetic
resonance (EPR) spectroscopy. The soot was then added to water, and a second
exposure to light was used to measure hydroxyl radical (OH) formation from
both photoaged and dark-aged soot. There were no changes to EPFR
characteristics (spin concentration, g factor, peak width, or lineshape) due
to the exposure to simulated sunlight; however, the soot's ability to form OH
was greatly reduced by photoaging. Photoaged soot resulted in an almost
60 % reduction in OH formation over soot which had been aged in the dark
for the same amount of time.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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