气候变化领域集成服务门户(CCPortal): Importance of NO3 radical in particulate nitrate formation in a southeast Chinese urban city: New constraints by δ15N-δ18O space of NO3-

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DOI	10.1016/j.atmosenv.2021.118387
	Importance of NO3 radical in particulate nitrate formation in a southeast Chinese urban city: New constraints by δ15N-δ18O space of NO3-
	Zhang Z.; Cao L.; Liang Y.; Guo W.; Guan H.; Zheng N.
发表日期	2021
ISSN	1352-2310
卷号	253
英文摘要	Stable nitrogen and oxygen isotopic signatures of nitrate in atmospheric fine-mode particulate (as δ15N–NO3- and δ18O–NO3- in PM2.5) was proposed to be useful in distinguishing the sources and oxidation chemistry of NOx (NOx = NO + NO2). In the present study, the chemical oxidation processes of atmospheric NOx in urban Nanchang, the capital of Jiangxi province, southeast of China were estimated based on the δ15N-δ18O space of NO3-. Daily PM2.5 samples (n = 91) were collected during wintertime of 2017–2018 (1 November to 31 January), the major water-soluble inorganic ions and the dual isotopic signatures of NO3- were measured. During the observations, the NO3- concentrations in PM2.5 varied widely from 0.8 μg/m3 to 57.7 μg/m3, on average of 15.5 ± 6.7 μg/m3. The δ15N–NO3- and δ18O–NO3- also ranged widely, from −1.9‰ to +12.1‰ (+6.5 ± 3.7‰) and +69.1‰ to +95.5‰ (+85.9 ± 17.7‰), respectively. The daily δ15N–NO3- was observed to be independent with the corresponding δ18O–NO3- (R2 = 0.06, p > 0.05), which contrasted with many previous reports. By linking the δ15N–NO3- to the NOx oxidation chemistry, we tried to explore the environmental significance of the δ15N-δ18O space of NO3-. Our results suggested that the nocturnal pathways (e.g., N2O5 hydrolysis and NO3 radical reacted with hydrocarbons: NO3+HCs) dominated the chemical conversion of NOx to NO3- in the wintertime of Nanchang, with an average fractional contribution of 60%. Interestingly, results also indicated the importance of the NO3+HCs channel in NOx oxidation (on average of 33%), which can reach 45% during extreme nitrate aerosol polluted days. Our observations highlighted the importance of NO3 radical in NOx oxidation and particulate nitrate formation in polluted urban environment. © 2021 Elsevier Ltd
关键词	Nanchang Nitrate NO3 radical PM2.5 δ15N-δ18O space
语种	英语
scopus关键词	Atmospheric chemistry; Isotopes; Nitrogen oxides; Oxidation; Particles (particulate matter); $+15$/N; Isotopic signatures; Nanchang; Nitrogen isotopic; NO3 radical; Oxidation chemistry; Particulate nitrate; PM$-2.5$; Urban cities; Δ15N-δ18O space; Nitrates; hydrocarbon; ion; nitrate; nitric oxide; nitrogen 15; organic nitrate; oxygen 18; radical; aerosol; hydrolysis; nitrate; nitrogen; nitrous oxide; oxidation; radical; urban atmosphere; aerosol; air pollution; air quality; Article; chemical analysis; China; dry deposition; environmental monitoring; haze; humidity; hydrolysis; nitrogen cycle; Northern Hemisphere; oxidation; particulate matter; pH; priority journal; surface property; urban area; water content; wind speed; 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/248470
作者单位	Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution, East China University of Technology, Nanchang, 330013, China; School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang, 330013, China; The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
推荐引用方式 GB/T 7714	Zhang Z.,Cao L.,Liang Y.,et al. Importance of NO3 radical in particulate nitrate formation in a southeast Chinese urban city: New constraints by δ15N-δ18O space of NO3-[J],2021,253.
APA	Zhang Z.,Cao L.,Liang Y.,Guo W.,Guan H.,&Zheng N..(2021).Importance of NO3 radical in particulate nitrate formation in a southeast Chinese urban city: New constraints by δ15N-δ18O space of NO3-.ATMOSPHERIC ENVIRONMENT,253.
MLA	Zhang Z.,et al."Importance of NO3 radical in particulate nitrate formation in a southeast Chinese urban city: New constraints by δ15N-δ18O space of NO3-".ATMOSPHERIC ENVIRONMENT 253(2021).