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DOI10.1016/j.atmosenv.2021.118782
Seasonal and diurnal variation of PM2.5 HULIS over Xi'an in Northwest China: Optical properties, chemical functional group, and relationship with reactive oxygen species (ROS)
Zhang T.; Huang S.; Wang D.; Sun J.; Zhang Q.; Xu H.; Hang Ho S.S.; Cao J.; Shen Z.
Date Issued2022
ISSN1352-2310
Volume268
Other AbstractHumic-like substances (HULIS) in particulate matter (PM) play critical roles in the atmospheric changes in our environment. In this study, high time resolution PM2.5 samples were collected to insight the abundances, spectroscopic characters, chemical groups, and oxidative potential of HULIS in Xi'an, China. The average mass concentrations of HULIS in term of carbon (HULIS-C) was 11.55 ± 5.85 and 8.28 ± 2.23 μg C m−3 in winter and summer, respectively. The diurnal variations of HULIS displayed three peaks (03:00–07:00, 10:00–14:00, and 18:00–21:00 LT) in winter, but a single peak (08:00–12:00 LT) in summer. The optical parameters show obvious difference between winter and summer. Fourier Transform infrared (FT-IR) spectra revealed that the HULIS mainly consisted of aliphatic chains, aromatic rings, and carboxylic groups. The FT-IR spectra proved that the aromatic compounds and carboxylic acids dominated the diurnal variation in winter, while carboxylic acids were responsible for that in summer. The normalized oxidative potential of HULIS exhibited an inverse trend with the HULIS-C concentration measured by the DCFH assay. The diurnal reactive oxygen species (ROS) productions from HULIS presents three valleys (03:00–07:00, 10:00–14:00, and 18:00–21:00 LT) in winter but only a single valley (08:00–12:00 LT) in summer. In addition, a positive correlation (R2 ≈ 0.6, p<0.01) between the oxidative potential and specific ultraviolet absorbance at a wavelength of 254 nm (SUVA254) in winter suggested that the oxidative power of HULIS could be more related to the compounds with high light absorbance, high aromaticity, and molecular weight. The results of this study offer more solid knowledge on the spectral and chemical characteristics and oxidative potential of the HULIS in PM2.5 of the typical city in northwest China. © 2021 Elsevier Ltd
KeywordChemical characterDiurnal variationHULISOptical propertiesOxidative potential
Language英语
scopus keywordsAromatic compounds; Aromatization; Carboxylic acids; Oxygen; Chemical character; Chemical functional groups; Diurnal variation; Fourier transform infrared spectra; Humic-like substances; NorthWest China; Oxidative potential; Particulate Matter; Reactive oxygen species; Seasonal and diurnal variations; Optical properties; alcohol derivative; aliphatic compound; amide; aromatic compound; carbon; carbonyl derivative; carboxyl group; carboxylic acid; functional group; hydroxyl group; ketone; phenol; phenol derivative; potassium; quinone derivative; reactive oxygen metabolite; detection method; diurnal variation; optical property; particulate matter; reactive oxygen species; seasonal variation; air sampling; Article; biomass conversion; chemical composition; chemical structure; circadian rhythm; concentration ratio; controlled study; Fourier transform infrared spectroscopy; geographic mapping; humic substance; light absorption; molecular weight; optics; oxidation reduction potential; particulate matter 2.5; radiation absorption; relative humidity; seasonal variation; summer; ultraviolet radiation; ultraviolet visible spectroscopy; winter; China; Shaanxi; Xian
journalATMOSPHERIC ENVIRONMENT
Document Type期刊论文
Identifierhttp://gcip.llas.ac.cn/handle/2XKMVOVA/248173
AffiliationDepartment 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; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Division of Atmospheric Sciences, Desert Research Institute, Reno, NV 89512, United States
Recommended Citation
GB/T 7714
Zhang T.,Huang S.,Wang D.,et al. Seasonal and diurnal variation of PM2.5 HULIS over Xi'an in Northwest China: Optical properties, chemical functional group, and relationship with reactive oxygen species (ROS)[J],2022,268.
APA Zhang T..,Huang S..,Wang D..,Sun J..,Zhang Q..,...&Shen Z..(2022).Seasonal and diurnal variation of PM2.5 HULIS over Xi'an in Northwest China: Optical properties, chemical functional group, and relationship with reactive oxygen species (ROS).ATMOSPHERIC ENVIRONMENT,268.
MLA Zhang T.,et al."Seasonal and diurnal variation of PM2.5 HULIS over Xi'an in Northwest China: Optical properties, chemical functional group, and relationship with reactive oxygen species (ROS)".ATMOSPHERIC ENVIRONMENT 268(2022).
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