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DOI	10.1016/j.atmosenv.2019.117106
	Characterization of a chemical amplifier for peroxy radical measurements in the atmosphere
	Duncianu M.; Lahib A.; Tomas A.; Stevens P.S.; Dusanter S.
发表日期	2020
ISSN	13522310
卷号	222
英文摘要	Peroxy radicals (HO2 and RO2) are key species in atmospheric chemistry. They are produced during the oxidation of volatile organic compounds (VOCs) and are involved in the formation of photochemical pollutants such as ozone (O3) and secondary organic aerosols (SOA). However, ambient measurements of these reactive species are still challenging and only a few techniques can achieve both a good selectivity and a detection limit that is low enough for ambient measurements. In this publication we present the characterization of a Chemical Amplifier (CA) using two different approaches for ambient measurements of peroxy radicals, including the PEroxy Radical Chemical Amplifier (PERCA) and the Ethane based CHemical AMPlification (ECHAMP). At 50% Relative Humidity (RH), the experimental Chain Length (CL) for PERCA was found to be higher by approximately a factor of 3.7 compared to ECHAMP. The RH-dependence of the CL was also found to be larger for PERCA by a factor of 1.12. Box modeling of the chemistry taking place in the instrument highlighted that the formation of HNO3 from the HO2+NO reaction has a strong impact on the CL for both approaches. In addition, experiments conducted to quantify the RO2–to-HO2 conversion efficiency for a large range of organic peroxy radicals confirmed that it mainly depends on the organic nitrate (RONO2) formation yield, while the alkyl nitrite (RONO) yield is not limiting the CL in most cases. Ambient measurements using the PERCA approach are shown to illustrate the performances of this new instrument. © 2019 Elsevier Ltd
英文关键词	Atmosphere; ECHAMP; Instrument development; PERCA; Peroxy radical chemical amplifier
学科领域	Air pollution; Atmospheric chemistry; Atmospheric humidity; Earth atmosphere; Volatile organic compounds; Ambient measurement; Chemical amplification; Chemical amplifiers; ECHAMP; Instrument development; Organic peroxy radicals; PERCA; Secondary organic aerosols; Nitric acid; ethane; organic nitrate; peroxy radical; ambient air; atmospheric chemistry; atmospheric pollution; instrumentation; measurement method; peroxy radical; photochemistry; volatile organic compound; absorption; ambient air; Article; atmosphere; chemical reaction; comparative study; environmental temperature; humidity; limit of detection; meteorology; oxidation; oxygen concentration; photolysis; priority journal; quantum yield; retention time; water vapor
语种	英语
scopus关键词	Air pollution; Atmospheric chemistry; Atmospheric humidity; Earth atmosphere; Volatile organic compounds; Ambient measurement; Chemical amplification; Chemical amplifiers; ECHAMP; Instrument development; Organic peroxy radicals; PERCA; Secondary organic aerosols; Nitric acid; ethane; organic nitrate; peroxy radical; ambient air; atmospheric chemistry; atmospheric pollution; instrumentation; measurement method; peroxy radical; photochemistry; volatile organic compound; absorption; ambient air; Article; atmosphere; chemical reaction; comparative study; environmental temperature; humidity; limit of detection; meteorology; oxidation; oxygen concentration; photolysis; priority journal; quantum yield; retention time; water vapor
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/120786
作者单位	IMT Lille Douai, Université de Lille, SAGE – Département Sciences de l'Atmosphère et Génie de l'Environnement, Lille, 59000, France; School of Public and Environmental Affairs, Indiana University, Bloomington, IN 47405, United States; Department of Chemistry, Indiana University, Bloomington, IN 47405, United States
推荐引用方式 GB/T 7714	Duncianu M.,Lahib A.,Tomas A.,et al. Characterization of a chemical amplifier for peroxy radical measurements in the atmosphere[J],2020,222.
APA	Duncianu M.,Lahib A.,Tomas A.,Stevens P.S.,&Dusanter S..(2020).Characterization of a chemical amplifier for peroxy radical measurements in the atmosphere.Atmospheric Environment,222.
MLA	Duncianu M.,et al."Characterization of a chemical amplifier for peroxy radical measurements in the atmosphere".Atmospheric Environment 222(2020).