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桂林市城区大气VOCs污染特征及对O3和SOA的生成潜势
Pollution Characteristics of Ambient VOCs and Its Formation Potential to Ozone and Secondary Organic Aerosol in Guilin City
投稿时间:2019-09-03  修订日期:2020-04-22
DOI:10.19316/j.issn.1002-6002.2020.04.04
中文关键词:  挥发性有机物  污染特征  臭氧  二次有机气溶胶  生成潜势
英文关键词:volatile organic compounds  pollution characteristics  ozone  secondary organic aerosol  formation potential
基金项目:广西重点研发计划项目(桂科AB16380303)
作者单位
银媛媛 广西壮族自治区桂林生态环境监测中心,广西桂林541004 
文建辉 广西壮族自治区桂林生态环境监测中心,广西桂林541004 
张旭峰 上海交通大学环境科学与工程学院,上海200240 
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中文摘要:
      对桂林市城区大气中挥发性有机物(VOCs)的污染特征,以及VOCs对臭氧(O3)和二次有机气溶胶(SOA)的生成潜势进行了研究。结果显示,研究期间,共检出VOCs物种78种,平均体积分数为21.32×10-9,表现为芳香烃(67.82%)>烷烃(19.56%)>卤代烃(7.50%)>烯烃(2.86%)>含氧挥发性有机物(1.41%)。VOCs体积分数空间分布呈现市中心和下风向郊区两个高值区。通过苯与甲苯的浓度比值发现,林科所VOCs主要来自交通源和生物源,师专甲山校区VOCs主要是来自交通源,其余测点VOCs主要来自交通源、工业源和外来传输源。分析乙苯和间/对二甲苯的浓度比值发现,电子科大尧山校区气团光化学年龄较大,光化学反应活性相对较强烈;旅游学院、华侨旅游经开区、大埠中心校气团光化学年龄较小,光化学反应活性相对较弱。VOCs对O3生成潜势最大的为芳香烃(93.81%),其次是烷烃(7.22%)和烯烃(4.75%);对SOA生成潜势最大的为芳香烃(97.45%),其次是烷烃(2.55%)。
英文摘要:
      The pollution characteristics of ambient volatile organic compounds (VOCs) and its formation potential to ozone and secondary organic aerosol in Guilin City were studied.The results showed that a total of 78 kinds of species were detected and the average volume fraction of VOCs observed was 21.32×10-9,which showed a descending order of aromatic hydrocarbons (67.82%) > alkanes (19.56%) > halogenated hydrocarbons (7.50%) > alkenes (2.86%) > oxygenated volatile organic compounds (1.41%).The spatial distribution characteristics of VOCs volume fraction showed two high values in urban area and downwind direction.The ratios of benzene to toluene concentration showed that traffic emission and biological source emissions were the main sources of VOCs at Institute of Forestry Science,traffic emission were the main sources of VOCs at Jiashan Campus of Normal Colleges,traffic emission,industrial process emission and external pollution sources were the main sources of VOCs at other monitoring points.The ratios of ethylbenzene to m-paraxylene concentration showed that the photochemical age of air mass was older and photochemical reaction activity was relatively strong at Jiashan Campus of University of Electronic Science and Technology,the photochemical age of air mass was small and photochemical reaction activity was relatively weak at Institute of Tourism,Tourist Economic Zone,and Central School in Dabu.The most contributed sources to O3 was aromatic hydrocarbons (93.81%),followed by alkanes (7.22%),the third is alkenes (4.75%).The most contributed sources to SOA was aromatic hydrocarbons (97.45%),followed by alkanes (2.55%).
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