西安市大气PM<sub>2.5</sub>分子演化和来源对其氧化潜势的影响

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摘要为探究西安市大气细颗粒物(PM_2.5)氧化潜势(OP)的季节变化及来源,采用二硫苏糖醇(DTT)法测定了质量归一化的OP水平(OP^DTTm),分析了PM_2.5化学组分对OP的影响,结合正矩阵因子分解耦合人工神经网络-多层感知器(PMF-ANN-MLP)模型定量排放源对OP^DTTm的贡献.结果表明:西安市大气OP^DTTm在夏季最高((13.2 ±5.4) pmol/(min∙μg)),冬季最低((5.6 ±2.7) pmol/(min∙μg)).相关性分析结果表明,含硝基的芳香族化合物和羧酸类有机分子对OP^DTTm生成具有重要作用,其分子丰度的差异是导致OP^DTTm呈现季节变化的主要原因.源解析揭示,扬尘源对OP^DTTm的贡献在春季最高(26.7%),夏季交通源的贡献最高(35.1%),二次源的贡献在秋季最高(23.2%),生物质燃烧(24.5%)和燃煤(25.8%)的贡献均在冬季最高.研究结果可为制定有效的大气污染防治措施以保护人群健康提供科学依据.

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	王帝伟
	沈振兴
	白鸽子
	李昊楠
	黄沙沙
	杨雪婷
	孙健
	徐红梅

关键词 ：氧化潜势, 分子组成, 源解析, MLP模型

Abstract：To investigate the seasonal variation and source of oxidative potential (OP) in atmospheric fine particulate matter (PM_2.5) in Xi’an, the mass normalized OP (OP^DTTm) was measured using the dithiothreitol (DTT) method, and the influence of chemical components of PM_2.5 on OP^DTTm was analyzed, and the contributions of different sources to OP^DTTm was quantified using a positive matrix factorization coupled with an artificial neural network multilayer perceptron (PMF-ANN-MLP) model. The findings revealed that OP^DTTm 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 OP^DTTm, and the difference in molecular abundance was the main reason for the seasonal variation of OP^DTTm. 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 OP^DTTm 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.

Key words： oxidative potential molecular composition source apportionment MLP Model

收稿日期: 2024-07-19

PACS:

X51

基金资助:国家自然科学基金资助项目(42477238)

通讯作者: 沈振兴,教授,zxshen@mail.xjtu.edu.cn E-mail: zxshen@mail.xjtu.edu.cn

作者简介: 王帝伟(1996-),男,河南周口人,西安交通大学博士研究生,主要从事大气颗粒物及棕碳方面的相关研究.发表论文3篇.wangdw1126@stu.xjtu.edu.cn.

引用本文:

王帝伟, 沈振兴, 白鸽子, 李昊楠, 黄沙沙, 杨雪婷, 孙健, 徐红梅. 西安市大气PM_2.5分子演化和来源对其氧化潜势的影响[J]. 中国环境科学, 2025, 45(2): 629-636. WANG Di-wei, SHEN Zhen-xing, BAI Ge-zi, LI Hao-nan, HUANG Sha-sha, YANG Xue-ting, SUN Jian, XU Hong-mei. Effects of molecular evolution and emission sources on atmospheric oxidative potential in Xi’an. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(2): 629-636.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2025/V45/I2/629

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