漯河市夏季大气挥发性有机物变化特征和来源解析 |
摘要点击 1852 全文点击 363 投稿时间:2023-11-02 修订日期:2024-01-03 |
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中文关键词 挥发性有机物(VOCs) 正定矩阵因子分解模型(PMF) 来源解析 漯河 变化特征 |
英文关键词 volatile organic compounds (VOCs) positive matrix factorization model (PMF) source apportionment Luohe City variation characteristics |
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中文摘要 |
漯河市是中原城市群重要的节点城市,近年来大气臭氧(O3)污染情势严峻.为此,于2022年7月在漯河市开展O3前体物挥发性有机物(VOCs)的在线观测,分析其变化特征并进行来源解析,为O3污染控制提供科学依据.观测期间φ(TVOCs)的均值为(16.49±5.73)×10-9. 其中,烷烃(33.7%)、含氧有机物OVOC(24.0%)和卤代烃(21.9%)占比前3.源解析结果表明,主要VOCs来源(贡献)分别有天然气(NG)使用(20.1%)、区域输送(14.8%)、溶剂使用(14.2%)、汽油车排放(12.3%)、工业排放(11.6%)、柴油车排放(10.5%)、液化石油气(LPG)使用(9.8%)和植物排放(6.7%). OVOC对臭氧生成潜势(OFP)和自由基损耗速率(L·OH)贡献最大.结果表明,机动车尾气贡献(22.8%)是漯河市VOCs的首要来源,但其它来源复杂且相对均衡,需要制定有针对性的综合防治措施. |
英文摘要 |
Luohe City is an important node city in the Central Plains Urban Agglomeration in China, where the atmospheric ozone (O3) pollution situation has been serious in recent years. In order to provide a scientific basis for O3 pollution control, the online filed observation of O3 precursor volatile organic compounds (VOCs) was carried out in Luohe City in July 2022 to understand their variation characteristics and sources. The mean ratio of φ(TVOCs) during the observation period was (16.49±5.73)×10-9. Among them, alkane (33.7%), oxygenated volatile organic compounds OVOC (24.0%), and halohydrocarbon (21.9%) accounted for the top three. The results from source apportionment showed that the main VOCs sources (contributions) included the natural gas (NG) use (20.1%), regional transport (14.8%), solvent use (14.2%), gasoline vehicle emissions (12.3%), industrial emissions (11.6%), diesel vehicle emissions (10.5%), liquefied petroleum gas (LPG) use (9.8%), and plant emissions (6.7%). OVOC contributed the most to ozone formation potential (OFP) and free radical loss rate (L·OH). The results showed that the contribution of motor vehicle exhaust (>22.8%) was the primary source of VOCs in Luohe City. However, other sources were complex and with comparable contributions, requiring the development of targeted and comprehensive prevention and control measures. |
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