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- W4382863048 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Environmentally persistent free radicals (EPFR) are a pollutant found on fine atmospheric particulate matter (PM<sub>2.5</sub>), particularly on PM<sub>2.5</sub> formed from combustion processes. EPFR are organic radicals that can endure in the environment for days to years. Interest in the toxicity of EPFR 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 PM<sub>2.5</sub> ages in the atmosphere. Here, we exposed newly produced hexane-generated soot to simulated sunlight for 24 hours. 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 photo-aged 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 photo-aging. Photo-aged 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." @default.
- W4382863048 created "2023-07-02" @default.
- W4382863048 creator A5071835984 @default.
- W4382863048 date "2023-05-16" @default.
- W4382863048 modified "2023-09-29" @default.
- W4382863048 title "Reply on AC2" @default.
- W4382863048 doi "https://doi.org/10.5194/egusphere-2023-4-ac3" @default.
- W4382863048 hasPublicationYear "2023" @default.
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