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DOI	10.1016/j.atmosres.2019.104784
	PM2.5 Humic-like substances over Xi'an; China: Optical properties; chemical functional group; and source identification
	Zhang T.; Shen Z.; Zhang L.; Tang Z.; Zhang Q.; Chen Q.; Lei Y.; Zeng Y.; Xu H.; Cao J.
发表日期	2020
ISSN	0169-8095
卷号	234
英文摘要	Humic-like substances (HULIS) in fine particulate matter (PM2.5) were investigated during May 2015 to January 2016 in an urban environment in Xi'an, China. UV-VIS spectrometer and Fourier transform infrared spectroscopy (FTIR) were used to investigate optical properties and chemical structures of HULIS. Annual mean concentrations of HULIS-C (the carbon content of HULIS) was 2.9 ± 2.1 μg m−3. On average, the contributions of HULIS-C to PM2.5, TC, and OC were 6.1%, 27.2%, and 34.5%, respectively. Seasonal average of HULIS-C concentration followed a decreasing order of winter, spring, summer, and autumn. The UV absorption intensity of PM2.5 HULIS showed the highest in winter and the lowest in summer. The chemical functional groups for PM2.5 HULIS were highlighted with the presence of aliphatic C[sbnd]H, hydroxy, carbonyl, carboxyl and aromatic rings structures. SUVA254 and SUVA280 values in autumn and winter exhibited more dispersive distribution than those in spring and summer, which indicated sources of HULIS in autumn and winter samples were relative complicated. The E2/E3 ratio showed a summer maximum and a winter minimum, indicating greater conjugation and aromaticity of HULIS in winter. In addition, strong correlations between HULIS-C with K+ and OC1 + OP2 in spring, autumn and especially winter implied the important source of biomass burning to PM2.5 HULIS. The C[sbnd]O stretching of COH, carbonyl groups (C[dbnd]O) and O[sbnd]H stretching of carboxylic acid were abundance both in winter and summer, implied that secondary organic aerosol (SOA) formation was found to be the dominant mechanism producing HULIS in Xi'an. © 2019 Elsevier B.V.
英文关键词	Chemical groups; Humic-like substances; Optical properties; Sources
语种	英语
scopus关键词	Elementary particle sources; Fourier transform infrared spectroscopy; Spectrometers; Chemical functional groups; Chemical group; Dispersive distribution; Fine particulate matter (PM2.5); Humic-like substances; Secondary organic aerosols; Source identification; UV-vis spectrometer; Optical properties; chemical property; FTIR spectroscopy; humic substance; optical property; particulate matter; source identification; urban atmosphere; China; Shaanxi; Xian
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141968
作者单位	Department of Environmental Sciences and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China; State Key laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710049, China; Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto, Canada; School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, China
推荐引用方式 GB/T 7714	Zhang T.,Shen Z.,Zhang L.,et al. PM2.5 Humic-like substances over Xi'an; China: Optical properties; chemical functional group; and source identification[J],2020,234.
APA	Zhang T..,Shen Z..,Zhang L..,Tang Z..,Zhang Q..,...&Cao J..(2020).PM2.5 Humic-like substances over Xi'an; China: Optical properties; chemical functional group; and source identification.Atmospheric Research,234.
MLA	Zhang T.,et al."PM2.5 Humic-like substances over Xi'an; China: Optical properties; chemical functional group; and source identification".Atmospheric Research 234(2020).