气候变化领域集成服务门户(CCPortal): Stability of environmentally persistent free radicals (EPFR) in atmospheric particulate matter and combustion particles

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DOI	10.1016/j.atmosenv.2020.117809
	Stability of environmentally persistent free radicals (EPFR) in atmospheric particulate matter and combustion particles
	Runberg H.L.; Mitchell D.G.; Eaton S.S.; Eaton G.R.; Majestic B.J.
发表日期	2020
ISSN	13522310
卷号	240
英文摘要	Environmentally persistent free radicals (EPFRs) are an emerging area of atmospheric interest due to their implications in adverse health effects. Previous EPFR studies have looked at 24-hour averages of EPFR concentration within ambient PM2.5. However, PM2.5 levels vary diurnally. This study demonstrates instrumental sensitivity that is adequate to assess EPFR concentrations at a much higher temporal resolution than previously reported. Ambient PM2.5 samples were collected for 90 min at 96 L min−1 and analyzed quantitatively via electron paramagnetic resonance (EPR) spectroscopy. For environmental samples that had no measurable PM2.5 mass, EPFR concentrations were found in the range of 1012 spins m−3, which is similar to values that have been reported previously in other urban locations. Additionally, since combustion products are likely to contribute to the EPFR portion of PM2.5, hexane generated soot was assessed for radical stability when exposed to water and ambient atmospheric conditions. Radical concentrations decreased by about 5% over the course of 88 days, but there was no difference in degradation rates between wetted and non-wetted soot. This study highlights the potential for sub-hourly EPFR monitoring which would allow for better insight into human exposure. © 2020 Elsevier Ltd
英文关键词	Electron paramagnetic resonance spectroscopy; Environmentally persistent free radicals; EPFR; Particulate matter; PM2.5; Quantitative EPR; Soot
语种	英语
scopus关键词	Combustion; Degradation; Electron spin resonance spectroscopy; Free radicals; Paramagnetic resonance; Soot; Wetting; Adverse health effects; Atmospheric conditions; Atmospheric particulate matter; Combustion products; Electron paramagnetic resonance spectroscopy; Environmental sample; Instrumental sensitivity; Radical concentration; Particles (particulate matter); free radical; hexane; water; combustion; concentration (composition); detection method; free radical; particulate matter; soot; air sampling; ambient air; Article; atmosphere; combustion; degradation; electron spin resonance; environmental temperature; particulate matter; priority journal; soot
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144986
作者单位	Department of Chemistry & Biochemistry, University of Denver, Denver, CO 80208, United States
推荐引用方式 GB/T 7714	Runberg H.L.,Mitchell D.G.,Eaton S.S.,et al. Stability of environmentally persistent free radicals (EPFR) in atmospheric particulate matter and combustion particles[J],2020,240.
APA	Runberg H.L.,Mitchell D.G.,Eaton S.S.,Eaton G.R.,&Majestic B.J..(2020).Stability of environmentally persistent free radicals (EPFR) in atmospheric particulate matter and combustion particles.Atmospheric Environment,240.
MLA	Runberg H.L.,et al."Stability of environmentally persistent free radicals (EPFR) in atmospheric particulate matter and combustion particles".Atmospheric Environment 240(2020).