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Research on the sources and optical properties of atmospheric humic-like substances during heavy pollution periods
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Jia-wen LIU1, 2, Qi-yuan WANG2, Qian ZHANG1, *, Jin WANG2, Chang-yan LI2, Li SUN3, 4
China Environmental Science | 2025, 45(4) : 1789 - 1798
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China Environmental Science | 2025, 45(4): 1789-1798
• Air Pollution Control •
Research on the sources and optical properties of atmospheric humic-like substances during heavy pollution periods
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Jia-wen LIU1, 2, Qi-yuan WANG2, Qian ZHANG1, *, Jin WANG2, Chang-yan LI2, Li SUN3, 4
Affiliations
  • 1.School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
  • 2.Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China
  • 3.Jiangsu Province Key Laboratory of Environmental Engineering, Jiangsu Province Environmental Science Research Institute, Nanjing 210036, China
  • 4.Jiangsu Province High-Tech Key Laboratory for Atmospheric Environmental Monitoring and Pollution Control, Jiangsu Province Collaborative Center for Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
Published: 2025-04-20
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The solid-phase extraction method and the thermal-optical method were combined to obtain different polar HULIS and the carbon content of HULIS (HULIS-C) in PM2.5 with high temporal resolution during the heavy pollution event in Xi'an. The light absorption characteristics of HULIS were analyzed using a UV-Vis spectrophotometer equipped with a liquid waveguide capillary cell (LWCC), and the positive matrix factorization model (PMF) was used to analyze the sources of HULIS. At the same time, the source of HULIS is combined with the positive matrix factorization model (PMF). The results showed that the average mass concentration of neutral HULIS (HULIS-n) (6.6±2.6)µg/m3 was higher than that of acidic HULIS (HULIS-a) (3.7±3.5)µg/m3, accounting for approximately 30% and 18% of OC, respectively, indicating severe HULIS pollution during heavy pollution periods. The absorption coefficients (AAE, E2/E3, and MAE365) of HULIS-n were all greater than those of HULIS-a, suggesting that HULIS-n contains more conjugated and aromatic structures and has stronger light-absorbing properties, with a more significant impact on atmospheric visibility. The source analysis revealed clear differences in the contributions of HULIS-n and HULIS-a. The primary sources of HULIS-n included secondary sources, coal combustion, motor vehicle emissions., while the contributions of secondary sources and coal combustion were higher for HULIS-a.

humic-like substances (HULIS)  /  haze  /  source apportionment  /  pollution cause
Jia-wen LIU, Qi-yuan WANG, Qian ZHANG, Jin WANG, Chang-yan LI, Li SUN. Research on the sources and optical properties of atmospheric humic-like substances during heavy pollution periods[J]. China Environmental Science, 2025 , 45 (4) : 1789 -1798 .
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Year 2025 volume 45 Issue 4
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  • Receive Date：2024-09-24
  • Online Date：2026-03-19
  • Published：2025-04-20
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  • Received：2024-09-24
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Affiliations
    1.School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
    2.Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China
    3.Jiangsu Province Key Laboratory of Environmental Engineering, Jiangsu Province Environmental Science Research Institute, Nanjing 210036, China
    4.Jiangsu Province High-Tech Key Laboratory for Atmospheric Environmental Monitoring and Pollution Control, Jiangsu Province Collaborative Center for Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
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表12种不同金属材料的力学参数
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Family		 属数
Number of
genus		 种数
Number of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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