气候变化领域集成服务门户(CCPortal): 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)

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DOI	10.1016/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.
发表日期	2022
ISSN	1352-2310
卷号	268
英文摘要	Humic-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
关键词	Chemical character Diurnal variation HULIS Optical properties Oxidative potential
语种	英语
scopus关键词	Aromatic 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
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/248173
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; 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
推荐引用方式 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).