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DOI	10.5194/acp-19-10865-2019
	Insight into the composition of organic compounds (≥C6) in PM2.5 in wintertime in Beijing; China
	Lyu R.; Shi Z.; Salim Alam M.; Wu X.; Liu D.; Vu T.V.; Stark C.; Fu P.; Feng Y.; Harrison R.M.
发表日期	2019
ISSN	16807316
起始页码	10865
结束页码	10881
卷号	19 期号:16
英文摘要	Organic matter is a major component of PM2:5 in megacities. In order to understand the detailed characteristics of organic compounds (≥C6) at a molecular level on nonhaze and haze days, we determined more than 300 organic compounds in the PM2:5 from an urban area of Beijing collected in November-December 2016 using two-dimensional gas chromatography coupled to time-of-flight mass spectrometry (GC×GC-ToF-MS). The identified organic compounds have been classified into groups, and quantitative methods were used to calculate their concentrations. Primary emission sources make significant contributions to the atmospheric organic compounds, and six groups (including nalkanes, polycyclic aromatic hydrocarbons-PAHs, levoglucosan, branched alkanes, n-alkenes and alkyl-benzenes) account for 66% of total identified organic compound mass. In addition, PAHs and oxygenated PAHs (O-PAHs) were abundant amongst the atmospheric organic compounds on both haze and non-haze days. The most abundant hydrocarbon groups were observed with a carbon atom range of C19-C28. In addition, the total concentration of unidentified compounds present in the chromatogram was estimated in the present study. The total identified compounds account for approximately 47% of total organic compounds (≥C6) in the chromatogram on both the non-haze and haze days. The total mass concentrations of organic compounds (≥C6) in the chromatogram were 4.0 and 7.4 μgm-3 on the non-haze and haze days, respectively, accounting for 26.4% and 18.5% of organic matter, respectively, on those days estimated from the total organic carbon concentration. Ratios of individual compound concentrations between haze and non-haze days do not give a clear indication of the degree of oxidation, but the overall distribution of organic compounds in the chromatogram provides strong evidence that the organic aerosol is less GC volatile and hence more highly oxidized on haze days. © Author(s) 2019.
语种	英语
scopus关键词	aerosol composition; concentration (composition); haze; liquid chromatography; megacity; organic compound; particulate matter; winter; Beijing [Beijing (ADS)]; Beijing [China]; China
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/144188
作者单位	State Environ. Protect. Key Lab. of Urban Ambient Air Particulate Matter Poll. Prev. and Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Division of Environmental Health and Risk Management, School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom; Institute of Surface Earth System Science, Tianjin University, Tianjin, 300350, China; Regional Department of Geology and Mineral Resources, China University of Geosciences, Xueyuan Road 29, Beijing, 100083, China; Centre of Excellence in Environmental Studies/Department of Environmental Sciences, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia; College of Resource and Environmental Sciences, Hebei Normal University for Nationalities, Chengde, 067000, China
推荐引用方式 GB/T 7714	Lyu R.,Shi Z.,Salim Alam M.,et al. Insight into the composition of organic compounds (≥C6) in PM2.5 in wintertime in Beijing; China[J],2019,19(16).
APA	Lyu R..,Shi Z..,Salim Alam M..,Wu X..,Liu D..,...&Harrison R.M..(2019).Insight into the composition of organic compounds (≥C6) in PM2.5 in wintertime in Beijing; China.Atmospheric Chemistry and Physics,19(16).
MLA	Lyu R.,et al."Insight into the composition of organic compounds (≥C6) in PM2.5 in wintertime in Beijing; China".Atmospheric Chemistry and Physics 19.16(2019).