Characterization of atmospheric humic-like substances (HULIS) at a high elevation in North China: Abundance, molecular composition and optical properties

被引:0
|
作者
Gong, Chaofan [1 ]
Liu, Xinghui [1 ]
Nie, Xiaoling [1 ,2 ]
Xu, Xinmiao [1 ]
Wang, Xinfeng [3 ]
Xue, Likun [3 ]
Wang, Yan [1 ]
机构
[1] Shandong Univ, Sch Environm Sci & Engn, Qingdao 266237, Peoples R China
[2] Univ Jinan, Sch Water Conservancy & Environm, Jinan 250022, Peoples R China
[3] Shandong Univ, Environm Res Inst, Qingdao 266237, Peoples R China
来源
JOURNAL OF ENVIRONMENTAL SCIENCES | 2025年 / 155卷
关键词
Humic-like substances (HULIS); Abundance; Optical property; FT-ICR MS; Mount Tai; PM2.5; DISSOLVED ORGANIC-MATTER; LIGHT-ABSORPTION; PARTICULATE MATTER; BIOMASS MATERIALS; BROWN CARBON; FLUORESCENCE; EXCITATION; CHEMISTRY; COMPONENTS; COMBUSTION;
D O I
10.1016/j.jes.2024.11.028
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The optical absorption of large molecular compounds HULIS (humic-like substances) can significantly impact the aerosol light absorption and radiative forcing, influencing cloud condensation nuclei formation and thus the climate and atmospheric environment. This study collected aerosol (PM2.5 ) samples from the summit of Mount Tai in North China to investigate the concentration, molecular composition, and optical properties of HULIS. The average concentration of HULIS in the PM2.5 in this study was 1.26 +/- 0.54 mu g/m3 , comprising for 56 % of the water-soluble organic carbon (WSOC), with levels lower than urban areas but higher than other mountainous regions. Mass spectrometry revealed that CHO and CHON components, with high aromaticity and phenolic groups, are major contributors to absorption and fluorescence. These results indicate that HULIS is mainly composed of lignin and proteins/amino sugars, derived from combustion and secondary formation, and possesses a high light absorption capacity (with MAE365 (mass absorption efficiency) and AAE (A & ring;ngstr & ouml;m exponent) indices of 0.62 m2 /g and 4.99, respectively). Parallel factor analysis identified three fluorescence components of HULIS, with proportions of 60.8 % for less oxygen humic-like substances, 21.0 % for high oxygen humic-like substances, and 18.2 % for protein-like substances. Our study highlights the significance of the light-absorbing capacity and secondary formation of HULIS at Mount Tai, laying the groundwork for investigation into the climate effects, formation mechanisms, and sources of HULIS generation. (c) 2025 The Research Center for Eco-Environmental Sciences, Chinese Academy of
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收藏
页码:673 / 685
页数:13
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