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DOI	10.1016/j.atmosenv.2020.117942
	Source apportionment of PM2.5 using online and offline measurements of chemical components in Tianjin; China
	Zhang W.; Peng X.; Bi X.; Cheng Y.; Liang D.; Wu J.; Tian Y.; Zhang Y.; Feng Y.
发表日期	2021
ISSN	13522310
卷号	244
英文摘要	PM2.5 and chemical species of water-soluble inorganic ions, carbon components as well as elements were simultaneously measured by online and offline methods in Tianjin, China. Online measured PM2.5, total carbon, and major ions showed good agreement with offline results (r > 0.7), while obvious differences were found for most elements with correlation coefficients lower than 0.6. Online measured ions and most elements (except As, Ca, Ni) showed higher or comparable estimated annual average concentrations than offline results. Sources of PM2.5 were identified by using Positive Matrix Factorization (PMF) model respectively with online and offline data. Higher contributions of secondary source (38%) and secondary sulfate (11%) for online method could be partly caused by higher concentrations of SO42− and NO3− compared to offline method (30%, 10%). Lower source contribution of dust for online (4%) method might partly relate to lower concentration of Ca compared to offline measurement (7%). Different source contribution estimates of vehicle emission and coal combustion between online (18%, 24%) and offline (21%, 25%) may be partly linked to variation of concentrations of OC and EC resulted from different analytical methods. Industrial source, and sea salt & biomass burning showed lower source contributions both online (4%, 1%) and offline (5%, 2%). © 2020 Elsevier Ltd
英文关键词	(X. H. Bi); Chemical components; Email address:; Offline measurement; Online measurement; PM2.5; Receptor model; Source apportionment
语种	英语
scopus关键词	Carbon; Factorization; Ions; Sulfur compounds; Annual average concentration; Chemical component; Correlation coefficient; Industrial sources; Positive matrix factorization models; Source apportionment; Source contributions; Water soluble inorganic ions; Coal combustion; anion; arsenic; aspartate aminotransferase; calcium; calcium ion; carbon; cation; chlorine; chromium; coal; inorganic compound; ion; iron; manganese; nitrate; organic carbon; potassium; selenium; sulfate; titanium; volatile organic compound; zinc ion; aerosol; air sampling; analytic method; Article; chemical composition; China; combustion; correlation coefficient; dust; falling; humidity; online analysis; online monitoring; particulate matter 2.5; priority journal; seasonal variation; solar radiation; summer; volatilization; water content; water vapor; winter
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/144854
作者单位	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
推荐引用方式 GB/T 7714	Zhang W.,Peng X.,Bi X.,et al. Source apportionment of PM2.5 using online and offline measurements of chemical components in Tianjin; China[J],2021,244.
APA	Zhang W..,Peng X..,Bi X..,Cheng Y..,Liang D..,...&Feng Y..(2021).Source apportionment of PM2.5 using online and offline measurements of chemical components in Tianjin; China.Atmospheric Environment,244.
MLA	Zhang W.,et al."Source apportionment of PM2.5 using online and offline measurements of chemical components in Tianjin; China".Atmospheric Environment 244(2021).