气候变化领域集成服务门户(CCPortal): Urban organic aerosol composition in eastern China differs from north to south: Molecular insight from a liquid chromatography-mass spectrometry (Orbitrap) study

CCPortal

DOI	10.5194/acp-21-9089-2021
	Urban organic aerosol composition in eastern China differs from north to south: Molecular insight from a liquid chromatography-mass spectrometry (Orbitrap) study
	Wang K.; Huang R.-J.; Brüggemann M.; Zhang Y.; Yang L.; Ni H.; Guo J.; Wang M.; Han J.; Bilde M.; Glasius M.; Hoffmann T.
发表日期	2021
ISSN	1680-7316
起始页码	9089
结束页码	9104
卷号	21 期号:11
英文摘要	Air pollution by particulate matter in China affects human health, the ecosystem and the climate. However, the chemical composition of particulate aerosol, especially of the organic fraction, is still not well understood. In this study, particulate aerosol samples with a diameter of ≤2.5g μm (PM2.5) were collected in January 2014 in three cities located in northeast, east and southeast China, namely Changchun, Shanghai and Guangzhou. Organic aerosol (OA) in the PM2.5 samples was analyzed by an ultrahigh-performance liquid chromatograph (UHPLC) coupled to a high-resolution Orbitrap mass spectrometer in both negative mode (ESI-) and positive mode electrospray ionization (ESI+). After non-target screening including the assignment of molecular formulas, the compounds were classified into five groups based on their elemental composition, i.e., CHO, CHON, CHN, CHOS and CHONS. The CHO, CHON and CHN groups present the dominant signal abundances of 81g %-99.7g % in the mass spectra and the majority of these compounds were assigned to mono- and polyaromatics, suggesting that anthropogenic emissions are a major source of urban OA in all three cities. However, the chemical characteristics of these compounds varied between the different cities. The degree of aromaticity and the number of polyaromatic compounds were substantially higher in samples from Changchun, which could be attributed to the large emissions from residential heating (i.e., coal combustion) during wintertime in northeast China. Moreover, the ESI- analysis showed higher H/C and O/C ratios for organic compounds in Shanghai and Guangzhou compared to samples from Changchun, indicating that OA undergoes more intense photochemical oxidation processes in lower-latitude regions of China and/or is affected to a larger degree by biogenic sources. The majority of sulfur-containing compounds (CHOS and CHONS) in all cities were assigned to aliphatic compounds with low degrees of unsaturation and aromaticity. Here again, samples from Shanghai and Guangzhou show a greater chemical similarity but differ largely from those from Changchun. It should be noted that the conclusions drawn in this study are mainly based on comparison of molecular formulas weighted by peak abundance and thus are associated with inherent uncertainties due to different ionization efficiencies for different organic species. © 2021 Kai Wang et al.
语种	英语
scopus关键词	aerosol composition; concentration (composition); liquid chromatography; mass spectrometry; molecular analysis; organic compound; China; Guangdong; Guangzhou; Shanghai
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246805
作者单位	State Key Laboratory of Loess and Quaternary Geology (SKLLQG), Center for Excellence in Quaternary Science and Global Change, Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth and Environment, Chinese Academy of Sciences, Xi'an, 710061, China; Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, Mainz, 55128, Germany; Open Studio for Oceanic-Continental Climate and Environment Changes, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266061, China; Atmospheric Chemistry Department (ACD), Leibniz Institute for Tropospheric Research (TROPOS), Permoserstraße 15, Leipzig, 04318, Germany; Department of Chemistry, Aarhus University, Langelandsgade 140, Aarhus C, 8000, Denmark; Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S3H6, Canada
推荐引用方式 GB/T 7714	Wang K.,Huang R.-J.,Brüggemann M.,et al. Urban organic aerosol composition in eastern China differs from north to south: Molecular insight from a liquid chromatography-mass spectrometry (Orbitrap) study[J],2021,21(11).
APA	Wang K..,Huang R.-J..,Brüggemann M..,Zhang Y..,Yang L..,...&Hoffmann T..(2021).Urban organic aerosol composition in eastern China differs from north to south: Molecular insight from a liquid chromatography-mass spectrometry (Orbitrap) study.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(11).
MLA	Wang K.,et al."Urban organic aerosol composition in eastern China differs from north to south: Molecular insight from a liquid chromatography-mass spectrometry (Orbitrap) study".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.11(2021).