| 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, Tian1,2; Huang, Shasha1; Wang, Diwei1; Sun, Jian1; Zhang, Qian3; Xu, Hongmei1; Ho, Steven Sai Hang4; Cao, Junji2; Shen, Zhenxing1,2 | |
| Corresponding Author | Shen, Zhenxing(zxshen@mail.xjtu.edu.cn) |
| 2022 | |
| Source Publication | ATMOSPHERIC ENVIRONMENT
 |
| ISSN | 1352-2310 |
| Volume | 268Pages:9 |
| Abstract | 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 mu g 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 (R-2 approximate to 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 char- acteristics and oxidative potential of the HULIS in PM2.5 of the typical city in northwest China. |
| Keyword | HULIS Optical properties Diurnal variation Chemical character Oxidative potential |
| DOI | 10.1016/j.atmosenv.2021.118782 |
| WOS Keyword | HUMIC-LIKE SUBSTANCES ; LIGHT-ABSORPTION PROPERTIES ; PARTICULATE MATTER PM2.5 ; SOLUBLE ORGANIC-MATTER ; PEARL RIVER DELTA ; BROWN CARBON ; ATMOSPHERIC AEROSOLS ; SOURCE APPORTIONMENT ; TEMPORAL VARIATIONS ; GUANZHONG PLAIN |
| Indexed By | SCI ; SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foun-dation of China[41877383] ; National Natural Science Foun-dation of China[41877376] ; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS[SKLLQG1919] |
| WOS Research Area | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
| Funding Organization | National Natural Science Foun-dation of China ; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS |
| WOS Subject | Environmental Sciences ; Meteorology & Atmospheric Sciences |
| WOS ID | WOS:000707012800001 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ieecas.cn/handle/361006/17110 |
| Collection | 粉尘与环境研究室 |
| Corresponding Author | Shen, Zhenxing |
| Affiliation | 1.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.Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Xian 710055, Peoples R China 4.Desert Res Inst, Div Atmospher Sci, Reno, NV 89512 USA |
| Recommended Citation GB/T 7714 | Zhang, Tian,Huang, Shasha,Wang, Diwei,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]. ATMOSPHERIC ENVIRONMENT,2022,268:9. |
| APA | Zhang, Tian.,Huang, Shasha.,Wang, Diwei.,Sun, Jian.,Zhang, Qian.,...&Shen, Zhenxing.(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,268,9. |
| MLA | Zhang, Tian,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):9. |
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