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PM2.5 Humic-like substances over Xi'an, China: Optical properties, chemical functional group, and source identification
Zhang, Tian1; Shen, Zhenxing1; Zhang, Leiming3; Tang, Zhuoyue1; Zhang, Qian1; Chen, Qingcai4; Lei, Yali1; Zeng, Yaling1; Xu, Hongmei1; Cao, Junji2
Corresponding AuthorShen, Zhenxing(zxshen@mail.xjtu.edu.cn)
2020-04-01
Source PublicationATMOSPHERIC RESEARCH
ISSN0169-8095
Volume234Pages:8
AbstractHumic-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 mu g 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-H, hydroxy, carbonyl, carboxyl and aromatic rings structures. SUVA(254) and SUVA(280) 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 E-2/E-3 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-O stretching of COH, carbonyl groups (C=O) and O-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.
KeywordHumic-like substances Optical properties Chemical groups Sources
DOI10.1016/j.atmosres.2019.104784
WOS KeywordSOLUBLE ORGANIC-MATTER ; LIGHT-ABSORPTION PROPERTIES ; RIVER DELTA REGION ; SEASONAL-VARIATIONS ; ATMOSPHERIC AEROSOLS ; PARTICULATE MATTER ; MOLECULAR-WEIGHT ; GUANZHONG PLAIN ; BROWN CARBON ; AMBIENT AEROSOLS
Indexed BySCI ; SCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41877383] ; National Natural Science Foundation of China[41573101] ; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS[SKLLQG1616]
WOS Research AreaMeteorology & Atmospheric Sciences
Funding OrganizationNational Natural Science Foundation of China ; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000513182600026
PublisherELSEVIER SCIENCE INC
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/12795
Collection粉尘与环境研究室
Corresponding AuthorShen, Zhenxing
Affiliation1.Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian 710049, Peoples R China
2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710049, Peoples R China
3.Environm & Climate Change Canada, Sci & Technol Branch, Air Qual Res Div, Toronto, ON, Canada
4.Shaanxi Univ Sci & Technol, Sch Environm Sci & Engn, Xian 710021, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Tian,Shen, Zhenxing,Zhang, Leiming,et al. PM2.5 Humic-like substances over Xi'an, China: Optical properties, chemical functional group, and source identification[J]. ATMOSPHERIC RESEARCH,2020,234:8.
APA Zhang, Tian.,Shen, Zhenxing.,Zhang, Leiming.,Tang, Zhuoyue.,Zhang, Qian.,...&Cao, Junji.(2020).PM2.5 Humic-like substances over Xi'an, China: Optical properties, chemical functional group, and source identification.ATMOSPHERIC RESEARCH,234,8.
MLA Zhang, Tian,et al."PM2.5 Humic-like substances over Xi'an, China: Optical properties, chemical functional group, and source identification".ATMOSPHERIC RESEARCH 234(2020):8.
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