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铜川市秋冬季大气VOCs特征及其O3和SOA形成潜势分析
摘要点击 2051  全文点击 867  投稿时间:2021-04-19  修订日期:2021-06-12
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中文关键词  挥发性有机物(VOCs)  臭氧(O3)  臭氧生成潜势(OFP)  二次有机气溶胶(SOA)  铜川市
英文关键词  volatile organic compounds(VOCs)  ozone(O3)  ozone formation potential(OFP)  secondary organic aerosol(SOA)  Tongchuan
作者单位E-mail
易宵霄 长安大学水利与环境学院, 西安 710064
长安大学旱区地下水文与生态效应教育部重点实验室, 西安 710064 
2020129076@chd.edu.cn 
李姜豪 长安大学水利与环境学院, 西安 710064
长安大学旱区地下水文与生态效应教育部重点实验室, 西安 710064 
 
李光华 长安大学水利与环境学院, 西安 710064  
路珍珍 长安大学水利与环境学院, 西安 710064  
孙智钢 长安大学水利与环境学院, 西安 710064  
高健 长安大学水利与环境学院, 西安 710064  
邓顺熙 长安大学水利与环境学院, 西安 710064
长安大学旱区地下水文与生态效应教育部重点实验室, 西安 710064 
dengshunxi@aliyun.com 
中文摘要
      VOCs是O3和SOA形成的重要前体物,可增强大气氧化性,促进二次污染物形成,影响区域空气质量和人体健康.为研究铜川市秋冬季VOCs特征及其对O3和SOA生成的潜力,利用TH-300B在线监测系统监测了铜川市区102种VOCs的体积分数,并结合最大增量反应活性系数法和气溶胶生成系数法分别计算VOCs的O3及SOA生成潜力.结果表明,铜川市秋季和冬季φ(TVOC)分别为(50.52±16.81)×10-9和(63.21±35.24)×10-9,O3生成潜势分别为138.43×10-9和137.123×10-9,SOA生成潜势分别为3.098μg·m-3和0.612μg·m-3.秋季VOCs中含量最多的2种组分为烷烃(26.19%)和芳香烃(26.04%),冬季VOCs中含量最多的组分为烷烃(48.88%).反-2-戊烯、甲苯和间/对-二甲苯是秋季OFPs最大的3个成分,乙烯、乙炔和丙烯是冬季OFPs最大的3个成分.甲苯、间/对-二甲苯和乙苯是秋冬季SOAFPs最大的3个成分.交通排放是秋冬季VOCs的主要来源,生物质燃烧/燃煤排放具有季节性差异,是冬季VOCs的主要来源.该结果可为铜川市等"一市一策"管控污染物排放、改善环境空气质量提供技术依据.
英文摘要
      Volatile organic compounds (VOCs) are the main precursors of tropospheric O3 and secondary organic aerosol (SOA), which can enhance atmospheric oxidation, promote the formation of secondary pollutants, and affect regional air quality and human health. In order to gain insights on VOCs characteristics and their potentials for O3 and SOA formation, the volume fraction of 102 VOCs in autumn and winter in the urban area of Tongchuan were monitored using the TH-300B online monitoring system. The maximum incremental reactivity (MIR) coefficient and the fractional aerosol coefficient (FAC) were used to estimate the ozone formation potential (OFP) and SOA formation potential (SOAFP), respectively. The φ(TVOC, total VOCs) were (50.52±16.81)×10-9 in autumn and (63.21±35.24)×10-9 in winter. The OFPs were 138.43×10-9 in autumn and 137.123×10-9 in winter, and the SOAFPs were 3.098 μg·m-3 and 0.612 μg·m-3, respectively. Alkanes (26.19%) and aromatics (26.04%) were the most abundant species in autumn, and alkanes (48.88%) were the most abundant species in winter. Trans-2-pentene, toluene, and m/p-xylene were the most reactive species in terms of OFPs in autumn, and ethylene, acetylene, and propylene were the top three species contributing to the total OFPs in winter. Toluene, m/p-xylene, and ethylbenzene contributed the most to the total SOAFPs in both of autumn and winter. Traffic emissions were considered as the major source of VOCs in both seasons. VOCs from biomass/coal combustion emissions showed seasonal differences, which were more prominent in winter. The results can provide references for the "one city, one policy" to mitigate regional VOCs pollution and improve ambient air quality.

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