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DOI	10.1016/j.atmosenv.2020.117910
	Formation of secondary organic aerosol from nitrate radical oxidation of phenolic VOCs: Implications for nitration mechanisms and brown carbon formation
	Mayorga R.J.; Zhao Z.; Zhang H.
发表日期	2021
ISSN	13522310
卷号	244
英文摘要	Volatile phenolic derivatives are substantially emitted from biomass burning and produced from photochemistry of atmospheric aromatic volatile organic compounds (VOCs). Oxidation of phenolic VOCs at night by nitrate radicals (NO3∙) may represent a significant source of secondary organic aerosols (SOA) and brown carbon (BrC) formation in the atmosphere. In this study, NO3∙ oxidation of five phenolic derivatives, including phenol, catechol, 3-methylcatechol, 4-methylcatechol and guaiacol are investigated in laboratory experiments. The SOA constituents from the NO3∙ oxidation were analyzed using electrospray ionization ion mobility spectrometry time-of-flight mass spectrometry, which allows for characterization and identification of isomers in the oxidation products. Through these analyses, several classes of nitro-containing products in addition to the well-known nitrophenol compounds were observed, including: (1) the nitrophenol type of products with additional hydroxyl functional groups; (2) non-aromatic/ring-opening nitro-products with lower double bond equivalence; (3) phenol and catechol products from the C7 phenolic VOCs with carbon-containing substitutions; and (4) nitrated diphenyl ether dimers. The present work indicates that new products from previously unrecognized pathways are formed during NO3∙ oxidation of phenolic VOCs and may contribute an important portion of the SOA. Some of these products were also observed in ambient aerosols during biomass burning. We suggest that the ubiquity of the nitrophenol type of products in the SOA derived from phenolic VOC + NO3∙ are responsible for the strong light absorption measured in this study. Therefore, elucidation of these pathways will be critical for understanding the nighttime oxidation and BrC formation mechanisms. © 2020 Elsevier Ltd
英文关键词	Biomass burning; Ion mobility spectrometry; Light absorption; Nighttime oxidation; Nitrophenols
语种	英语
scopus关键词	Aerosols; Bromine compounds; Carbon; Electrospray ionization; Equivalence classes; Isomers; Light absorption; Mass spectrometry; Nitrates; Nitration; Phenols; Volatile organic compounds; Formation mechanism; In-laboratory experiments; Ion mobility spectrometry; Nitration mechanism; Oxidation products; Phenolic derivative; Secondary organic aerosols; Time of flight mass spectrometry; Oxidation; carbon; catechol; dimer; nitrate; nitrophenol; phenol; phenol derivative; radical; volatile organic compound; absorption; aerosol formation; biomass burning; brown carbon; nitrate; oxidation; phenolic compound; radical; volatile organic compound; Article; biomass; collisionally activated dissociation; dimerization; electrospray; ion mobility spectrometry; isomer; light absorption; nitration; oxidation; priority journal; secondary organic aerosol; steady state; time of flight mass spectrometry; ultraviolet visible spectroscopy
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/144869
作者单位	Department of Chemistry, University of California, Riverside, CA 92521, United States
推荐引用方式 GB/T 7714	Mayorga R.J.,Zhao Z.,Zhang H.. Formation of secondary organic aerosol from nitrate radical oxidation of phenolic VOCs: Implications for nitration mechanisms and brown carbon formation[J],2021,244.
APA	Mayorga R.J.,Zhao Z.,&Zhang H..(2021).Formation of secondary organic aerosol from nitrate radical oxidation of phenolic VOCs: Implications for nitration mechanisms and brown carbon formation.Atmospheric Environment,244.
MLA	Mayorga R.J.,et al."Formation of secondary organic aerosol from nitrate radical oxidation of phenolic VOCs: Implications for nitration mechanisms and brown carbon formation".Atmospheric Environment 244(2021).