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DOI	10.1016/j.atmosenv.2020.117407
	PM2.5-bound unresolved complex mixtures (UCM) in the Pearl River Delta region: Abundance, atmospheric processes and sources
	Fang H.; Lowther S.D.; Zhu M.; Pei C.; Li S.; Fang Z.; Yu X.; Yu Q.; Wang Y.; Zhang Y.; Jones K.C.; Wang X.
发表日期	2020
ISSN	1352-2310
卷号	226
英文摘要	Unresolved complex mixture (UCM) accounts for a substantial fraction of particulate organic matters and plays an important role in forming secondary organic aerosol (SOA), yet their abundance, sources and atmospheric processes are not well understood. In this study, filter-based ambient PM2.5 samples were collected concourrently at an urban site and a rural site in the Pearl River Delta (PRD) region, south China, to characterize semi-volatile UCM. Dust, urban tunnel exhaust, ship exhaust and biomass burning samples were also collected to characterize UCM from typical primary emission sources. No obvious UCM humps were found in total ion chromatograms (TIC) of the PM2.5 samples collected during July–October, while the determined UCM reached 6.51 ± 4.92 μg/m3 at the urban site and 6.75 ± 4.78 μg/m3 at the rural site during November–May, accounting for ~9% of PM2.5 mass at both sites. The missing UCM humps in the hot months were due to much large fraction of these semi-volatiles partitioning to gas phase and their much faster atmospheric oxidation. In addition, the lower organic matter (OM) was also a non-negligible factor contributing to less particulate UCM in summer. Five major sources for PM2.5-bound UCM were identified by positive matrix factorization (PMF) involving organic and inorganic molecular source tracers. Vehicle exhaust accounted for 44.4% and 30.3% of UCM at the urban and the rural site, respectively. Biomass burning contributed more to UCM at the rural site (28.0%) than at the urban site (19.2%). Ship emission was found to contribute substantially to UCM (28.9% at the urban and 17.3% at the rural site) in the PRD harbor megacity. Coal combustion and dust altogether contributed much less at the urban site (7.5%) than at the rural site (24.4%). © 2020 Elsevier Ltd
关键词	Biomass burning Gas/particle partitioning Ship emission Source apportionment Unresolved complex mixtures (UCM)Vehicle exhaust
语种	英语
scopus关键词	Biogeochemistry; Biomass; Chromatographic analysis; Coal combustion; Coal dust; Factorization; Gases; Mixtures; Organic compounds; Particles (particulate matter); Ships; Biomass-burning; Gas/particle partitioning; Ship emissions; Source apportionment; Unresolved complex mixtures; Vehicle exhausts; Urban growth; coal; organic matter; aerosol; biomass burning; exhaust emission; organic matter; particulate matter; pollutant source; source apportionment; urban pollution; urban site; Article; biomass; China; combustion; concentration (parameter); drug mixture; dust; exhaust gas; gas; ion chromatography; non-negative matrix factorization; oxidation; particulate matter; photooxidation; priority journal; river; rural area; ship; summer; urban area; Zhujiang Delta
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/249239
作者单位	State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, United Kingdom; Guangzhou Environmental Monitoring Center, Guangzhou, 510060, China
推荐引用方式 GB/T 7714	Fang H.,Lowther S.D.,Zhu M.,et al. PM2.5-bound unresolved complex mixtures (UCM) in the Pearl River Delta region: Abundance, atmospheric processes and sources[J],2020,226.
APA	Fang H..,Lowther S.D..,Zhu M..,Pei C..,Li S..,...&Wang X..(2020).PM2.5-bound unresolved complex mixtures (UCM) in the Pearl River Delta region: Abundance, atmospheric processes and sources.ATMOSPHERIC ENVIRONMENT,226.
MLA	Fang H.,et al."PM2.5-bound unresolved complex mixtures (UCM) in the Pearl River Delta region: Abundance, atmospheric processes and sources".ATMOSPHERIC ENVIRONMENT 226(2020).