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Effects of molecular evolution and emission sources on atmospheric oxidative potential in Xi’an
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Di-wei WANG, Zhen-xing SHEN*, Ge-zi BAI, Hao-nan LI, Sha-sha HUANG, Xue-ting YANG, Jian SUN, Hong-mei XU
China Environmental Science | 2025, 45(2) : 629 - 636
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China Environmental Science | 2025, 45(2): 629-636
• Air Pollution Control •
Effects of molecular evolution and emission sources on atmospheric oxidative potential in Xi’an
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Di-wei WANG, Zhen-xing SHEN*, Ge-zi BAI, Hao-nan LI, Sha-sha HUANG, Xue-ting YANG, Jian SUN, Hong-mei XU
Affiliations
  • Department of Environmental Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Published: 2025-02-20
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To investigate the seasonal variation and source of oxidative potential (OP) in atmospheric fine particulate matter (PM2.5) in Xi’an, the mass normalized OP (OPDTTm) was measured using the dithiothreitol (DTT) method, and the influence of chemical components of PM2.5 on OPDTTm was analyzed, and the contributions of different sources to OPDTTm was quantified using a positive matrix factorization coupled with an artificial neural network multilayer perceptron (PMF-ANN-MLP) model. The findings revealed that OPDTTm in Xi’an was highest during summer ((13.2 ± 5.4) pmol(min·µg)) and lowest in winter ((5.6 ± 2.7) pmol(min·µg)). Correlation analysis indicated that nitro-containing aromatic compounds and carboxylic acids have a significant impact on OPDTTm, and the difference in molecular abundance was the main reason for the seasonal variation of OPDTTm. Source apportionment showed that dust (26.7%), traffic (35.1%), secondary formation (23.2%), and biomass burning (24.5%) and coal combustion (25.8%) were the predominant contributors to OPDTTm during spring, summer, autumn, and winter, respectively. These results provide a scientific foundation for developing effective air pollution control measures aimed at safeguarding public health.

oxidative potential  /  molecular composition  /  source apportionment  /  MLP Model
Di-wei WANG, Zhen-xing SHEN, Ge-zi BAI, Hao-nan LI, Sha-sha HUANG, Xue-ting YANG, Jian SUN, Hong-mei XU. Effects of molecular evolution and emission sources on atmospheric oxidative potential in Xi’an[J]. China Environmental Science, 2025 , 45 (2) : 629 -636 .
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  • Receive Date：2024-07-19
  • Online Date：2026-03-17
  • Published：2025-02-20
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  • Received：2024-07-19
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    Department of Environmental Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
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Genus		 种数
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Percentage of total
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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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