Acta Scientiarum Naturalium Universitatis Pekinensis ›› 2024, Vol. 60 ›› Issue (2): 329-340.DOI: 10.13209/j.0479-8023.2024.007

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Characteristics and Source Apportionment of Atmospheric Volatile Organic Compounds of Tai’an Urban Area in Autumn

WANG Lu1, ZHOU Xu2, LIU Yuehui3,†, LIU Hui4, ZHANG Yinglei1, FAN Guangyu1   

  1. 1. Beijing Capital Air Environmental Science & Technology Co., Ltd., Beijing 100176 2. CMA Weather Modification Center (WMC), Beijing 100081 3. PIESAT Information Technology Co., Ltd., Beijing 100195 4. Shaanxi Meteorological Observatory, Xi’an 710014
  • Received:2023-03-09 Revised:2023-05-16 Online:2024-03-20 Published:2024-03-20
  • Contact: LIU Yuehui, E-mail: yuehui.liu(at)pku.edu.cn

泰安市区秋季大气挥发性有机物污染特征及来源解析

王璐1, 周旭2, 刘跃辉3,†, 刘慧4, 张英磊1, 范光宇1   

  1. 1. 北京首创大气环境科技股份有限公司, 北京 100176 2. 中国气象局人工影响天气中心, 北京 100081 3. 航天宏图信息技术股份有限公司, 北京 100195 4. 陕西省气象台, 西安 710014
  • 通讯作者: 刘跃辉, E-mail: yuehui.liu(at)pku.edu.cn
  • 基金资助:
    中国博士后科学基金(2021M700214)资助

Abstract:

The preconcentration/gas chromatography-mass spectrometry with FID detector method was used to observe the 115 atmospheric volatile organic compounds (VOCs) of Tai’an urban area in autumn 2020. The average volume fraction of VOCs during the observation period was (67.50±25.55)×10−9, dominated by alkanes (34.86%) and oxygenated volatile organic compounds (OVOCs) (32.03%). The atmospheric chemistry reactivity of VOCs was estimated using ozone formation potential (OFP) and the OH radical loss rate (LOH), respectively. The OFP of Tai’an in autumn was (241.50±6.91)×10−9, mainly contributed by OVOCs (39.92%) and aromatics (33.03%). The calculated LOH was 7.34±0.33 s−1, which was dominated by OVOCs (56.32%). The contribution of VOCs to the potential for secondary organic aerosol (SOA) formation was estimated using the fractional aerosol coefficients (FAC), and the results showed that SOA formation potential was (366.58±37.80)×10−9, dominated by aromatics (98.79%). The results of the characteristic species ratio analysis showed that the VOCs of Tai’an in autumn were influenced by local sources such as traffic-related emissions, solvent use and combustion sources. The source apportionment results showed that the contribution of motor vehicle emissions to VOCs was the highest at 26.1%, with the contributions from gasoline vehicle exhaust emissions and diesel vehicle exhaust emissions being 19.4% and 6.7%. The contribution of solvent use and industrial sources to VOCs was comparable at 20.1% and 19.9%, respectively. The contribution of stationary combustion sources and liquefied petroleum gas (LPG) use was 16.2% and 12.3%, respectively. Biogenic sources contributed the lowest percentage of 5.4%.

Key words:

摘要:

采用罐采样预浓缩/气相色谱–质谱联用法, 对泰安市区秋季(2020年10月17日至27日)115种大气挥发性有机污染物(VOCs)进行观测。结果表明, 采样期间泰安市区秋季VOCs体积分数为(67.50±25.55)×10−9, 其中以烷烃(34.86%)和含氧挥发性有机物(OVOCs) (32.03%)为主。分别应用臭氧生成潜势(OFP)和OH消耗速率LOH评估观测期间VOCs的大气化学反应活性, 发现秋季泰安市区的 OFP为(241.50±6.91)×10−9, 主要由OVOCs(39.92%)和芳香烃(33.03%)贡献。LOH为7.34±0.33 s−1, OVOCs贡献56.32%。使用气溶胶生成系数法(FAC)估算观测期间VOCs对二次有机气溶胶(SOA)生成潜势的贡献, 结果表明SOA生成潜势为(366.58± 37.80)×10−9, 以芳香烃(98.79%)为主。特征物种比值分析结果显示, 泰安市区秋季VOCs受机动车尾气、溶剂使用和燃烧源等本地源的影响较大。PMF源解析结果表明, 机动车排放对VOCs的贡献占比最高为26.1%, 其中来自汽油车尾气排放和柴油车尾气排放的贡献分别为19.4%和6.7%; 溶剂使用和工业源对VOCs的贡献占比相当, 分别为20.1%和19.9%; 固定燃烧源和液化石油气(LPG)使用的贡献分别为16.2%和12.3%; 植物源贡献占比最低, 为5.4%。

关键词: 挥发性有机物(VOCs), 反应 活性, 二次有机气溶胶(SOA), 特征物种比值, 来源解析