首页|Water-soluble organic matter with various polarities in PM2.5 over Xi'an,China:Abundance,functional groups,and light absorption

Water-soluble organic matter with various polarities in PM2.5 over Xi'an,China:Abundance,functional groups,and light absorption

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Humic-like substances(HULIS)are a major component of brown carbon and consequently play a major role in climate change.In this study,70 PM2.5 samples were collected from Xi'an in winter 2019 and summer 2020.Neutral HULIS(HULIS-n),acidic HULIS(HULIS-a),and high-polarity water-soluble organic compounds(HP-WSOC)were analyzed to determine their carbon concentrations and measure their ultraviolet-visible absorption and infrared spectra.Of the three components,HULIS-n had the highest carbon content in both winter(3.29±1.45 μg m-3)and in summer(1.38±1.10 μg m-3).The semi-quantitative results for the functional groups revealed that HP-WSOC was rich in carboxylic acids and had high aromaticity in winter,whereas HULIS-n was rich in carboxylic acids in summer.Moreover,HULJS-a was richer in nitrate esters and saturated aliphatic hydrocarbons in summer than in winter.The results for specific ultraviolet absorbance(SUVA)and E250/E365 revealed that HULIS had higher molecular weight and aromaticity in winter than in summer.HULIS-n dominated in the total light absorption of HULIS+HP-WSOC in both winter(73.08％)and summer(48.57％).Overall,the results on the carbon content,optical properties,and functional groups of WSOCs with differing polarity can improve un-derstanding of environmental and climatic effects.

Humic-like substances(HULIS)AromaticityFourier-transform infrared(FTIR)spectroscopyLight absorbance

Xueting Yang、Shasha Huang、Dan Li、Hongmei Xu、Yaling Zeng、Liu Yang、Diwei Wang、Ningning Zhang、Junji Cao、Zhenxing Shen

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Department of Environmental Science and Engineering,Xi'an Jiaotong University,Xi'an,710049,China

School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an,710049,China

Key R&D project of Shaanxi ProvinceChinese Academy of sciences(CAS)"Light of West China"ProgramState Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,CASState Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,CAS

2022ZDLSF06-07XAB2021YN06SKLLQG2103SKLLQG2110

2024

10.1016/j.partic.2023.07.005

颗粒学报(英文版)
中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD
影响因子：0.632
ISSN：1674-2001
年,卷(期)：2024.84(1)
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