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DOI	10.5194/acp-19-2233-2019
	Aliphatic carbonyl compounds (C8-C26) in wintertime atmospheric aerosol in London; UK
	Lyu R.; Alam M.S.; Stark C.; Xu R.; Shi Z.; Feng Y.; Harrison R.M.
发表日期	2019
ISSN	16807316
起始页码	2233
结束页码	2246
卷号	19 期号:4
英文摘要	Three groups of aliphatic carbonyl compounds, the n-alkanals (C8-C20), n-alkan-2-ones (C8-C26), and n- alkan-3-ones (C8-C19), were measured in both particulate and vapour phases in air samples collected in London from January to April 2017. Four sites were sampled including two rooftop background sites, one ground-level urban background site, and a street canyon location on Marylebone Road in central London. The n-alkanals showed the highest concentrations, followed by the n-alkan-2-ones and the n-alkan-3-ones, the latter having appreciably lower concentrations. It seems likely that all compound groups have both primary and secondary sources and these are considered in light of published laboratory work on the oxidation products of high-molecular-weight n-alkanes. All compound groups show a relatively low correlation with black carbon and NOx in the background air of London, but in street canyon air heavily impacted by vehicle emissions, stronger correlations emerge, especially for the n-alkanals. It appears that vehicle exhaust is likely to be a major contributor for concentrations of the n-alkanals, whereas it is a much smaller contributor to the n-alkan-2-ones and n-alkan-3-ones. Other primary sources such as cooking or wood burning may be contributors for the ketones but were not directly evaluated. It seems likely that there is also a significant contribution from the photo-oxidation of n-alkanes and this would be consistent with the much higher abundance of n-alkan-2-ones relative to n-alkan-3-ones if the formation mechanism were through the oxidation of condensed-phase alkanes. Vapour-particle partitioning fitted the Pankow model well for the n-alkan-2- ones but less well for the other compound groups, although somewhat stronger relationships were seen at the Marylebone Road site than at the background sites. The former observation gives support to the n-alkane-2-ones being a predominantly secondary product, whereas primary sources of the other groups are more prominent. © 2019. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	aerosol; aliphatic hydrocarbon; concentration (composition); formation mechanism; oxidation; street canyon; traffic emission; urban atmosphere; winter; City of Westminster; England; London [England]; Marylebone; United Kingdom
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/144630
作者单位	Division of Environmental Health and Risk Management, School of Geography, Earth and Environmental Sciences, University of Birmingham Edgbaston, Birmingham, B15 2TT, United Kingdom; State Environmental Protection, Key Laboratory of Urban Ambient Air Particulate, Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China; Department of Environmental Sciences, Centre of Excellence in Environmental Studies, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia
推荐引用方式 GB/T 7714	Lyu R.,Alam M.S.,Stark C.,et al. Aliphatic carbonyl compounds (C8-C26) in wintertime atmospheric aerosol in London; UK[J],2019,19(4).
APA	Lyu R..,Alam M.S..,Stark C..,Xu R..,Shi Z..,...&Harrison R.M..(2019).Aliphatic carbonyl compounds (C8-C26) in wintertime atmospheric aerosol in London; UK.Atmospheric Chemistry and Physics,19(4).
MLA	Lyu R.,et al."Aliphatic carbonyl compounds (C8-C26) in wintertime atmospheric aerosol in London; UK".Atmospheric Chemistry and Physics 19.4(2019).