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DOI	10.1016/j.atmosenv.2020.117712
	Characterizing chemical composition and light absorption of nitroaromatic compounds in the winter of Beijing
	Li X.; Wang Y.; Hu M.; Tan T.; Li M.; Wu Z.; Chen S.; Tang X.
发表日期	2020
ISSN	1352-2310
卷号	237
英文摘要	Nitroaromatic compounds (NACs) were believed as one of the major light absorption components in brown carbon (BrC) and important fractions of organic aerosols. To understand the chemical compositions and light absorption of NACs in the highly polluted atmospheres, a field campaign was conducted in the winter of urban Beijing. Ambient PM2.5 samples were collected and a total of 12 NACs were identified and quantified using ultrahigh performance liquid chromatography coupled to Orbitrap mass spectrometer. Light absorption of methanol-extracted BrC and individual NAC in PM2.5 were also measured using UV–Vis spectrophotometer. The average concentration of quantified NACs was 173 ± 137 ng/m3, ranging from 19 to 585 ng/m3, which was much higher than those in summer in Beijing or in winter in other areas. Nitrophenols and nitrocatechols are the dominant species among the identified NACs in the winter of Beijing. Four pollution episodes were observed during the observation. The NAC concentrations increased from 62 ng/m3 during clean days to 224 ng/m3 during pollution episodes, with both secondary formation and biomass burning emissions as important sources. Particulate BrC was estimated to contribute as high as 45% of the total light absorption of carbonaceous aerosols at 370 nm based on the online aethalometer measurement. The identified NACs contributed about 17% of the total absorption by methanol-extracted BrC at 370 nm, though the mass concentrations of quantified NACs only accounted for 0.6% of the organic matter. This indicates the high absorption capability of NACs, which needs to be taken into consideration when studying the aerosol light absorption in urban environments. Moreover, the maximum absorption values of NACs among the range of 300–400 nm made them important to atmospheric photochemistry reactions. The linkage between chemical compositions and light absorption of NACs deserves to be further investigated to understand the light absorption mechanisms and environmental impacts of organic aerosols. © 2020 Elsevier Ltd
关键词	Beijing Brown carbon Light absorption Nitroaromatic compounds Urban
语种	英语
scopus关键词	Aerosols; Aromatic compounds; Bromine compounds; Liquid chromatography; Methanol; Pollution; Absorption capability; Aerosol light absorption; Atmospheric photochemistry; Average concentration; Biomass burning emissions; Nitroaromatic compound; Total light absorption; Ultra-high performance liquid chromatographies; Light absorption; 4 nitrocatechol; aromatic nitro compound; nitrophenol; absorption; aerosol; biomass burning; brown carbon; chemical composition; chemical compound; photochemistry; aerosol; air pollution; ambient air; Article; biomass; carbon footprint; chemical composition; China; light absorption; limit of quantitation; particulate matter; priority journal; summer; temporal analysis; ultra performance liquid chromatography; ultraviolet visible spectrophotometry; urban area; winter; Beijing [China]; China
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/249050
作者单位	State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China; Beijing Innovation Center for Engineering Sciences and Advanced Technology, Peking University, Beijing, China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing, China
推荐引用方式 GB/T 7714	Li X.,Wang Y.,Hu M.,et al. Characterizing chemical composition and light absorption of nitroaromatic compounds in the winter of Beijing[J],2020,237.
APA	Li X..,Wang Y..,Hu M..,Tan T..,Li M..,...&Tang X..(2020).Characterizing chemical composition and light absorption of nitroaromatic compounds in the winter of Beijing.ATMOSPHERIC ENVIRONMENT,237.
MLA	Li X.,et al."Characterizing chemical composition and light absorption of nitroaromatic compounds in the winter of Beijing".ATMOSPHERIC ENVIRONMENT 237(2020).