引用本文:刘芮伶,李礼,余家燕,许丽萍,冯凝,刘敏,等.重庆市夏秋季VOCs对臭氧和二次有机气溶胶生成潜势的估算[J].环境科学研究,2017,30(8):1193-1200.
LIU Ruiling,LI Li,YU Jiayan,XU Liping,FENG Ning,LIU Min,et al.Estimation of the Formation Potential of Ozone and Secondary Organic Aerosols in Summer and Autumn in Chongqing[J].Reserrch of Environmental Science,2017,30(8):1193-1200.]
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重庆市夏秋季VOCs对臭氧和二次有机气溶胶生成潜势的估算
刘芮伶1, 李 礼1, 余家燕1, 许丽萍1, 冯 凝2, 刘 敏1
1.重庆市生态环境监测中心, 城市大气环境综合观测与污染防控重庆市重点实验室, 重庆 401147 ;2.北京大学深圳研究生院环境与能源学院, 深圳城市人居环境科学与技术重点实验室, 广东 深圳 518055
摘要:
为估算重庆市夏秋季VOCs(挥发性有机物)对O3和SOA(二次有机气溶胶)的生成潜势,利用在线GC-MS/FID在2015年8月22日—9月23日对重庆市区点和郊区点VOCs开展了为期一个月的实时观测,获得市区点和郊区点φ(TVOCs)(总挥发性有机物)分别为41.35×10-9和22.72×10-9,其中市区点以烷烃(35.2%)和烯炔烃(25.2%)为主,郊区点以含氧挥发性有机物(oxygenated volatile organic compounds, OVOCs)(30.6%)和烷烃(26.0%)为主. 结合最大增量反应活性量化市区点和郊区点VOCs的OFPs(臭氧生成潜势)分别为149.11×10-9和71.09×10-9,市区点OFPs最大的是乙烯、丙烯、甲苯、C8和C9的芳香烃等,郊区点OFPs最大的VOCs是丙烯醛、异戊二烯和甲基乙烯基酮. 结合气溶胶生成系数量化郊区点和市区点VOCs对SOA的生成贡献分别为0.36和1.26 μg/m3,相比国内其余城市VOCs的SOAP(二次有机气溶胶生成潜势)较小,主要以甲基环己烷、正壬烷、正葵烷和十一烷等高碳烷烃,以及甲苯、苯、二甲苯和乙苯等芳香烃的SOAP为主. 研究显示,控制烯炔烃和芳香烃的浓度有助于控制重庆市O3的生成,控制高碳烷烃和芳香烃则有助于控制重庆市SOA的生成.
关键词:  挥发性有机物  臭氧生成潜势  二次有机气溶胶
DOI:
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基金项目:重庆市环境保护“五大行动”专项
Estimation of the Formation Potential of Ozone and Secondary Organic Aerosols in Summer and Autumn in Chongqing
LIU Ruiling1, LI Li1, YU Jiayan1, XU Liping1, FENG Ning2, LIU Min1
1.Chongqing Key Laboratory for Urban Atmospheric Environment Integrated Observation & Pollution Prevention and Control, Ecological & Environmental Monitoring Center of Chongqing, Chongqing 401147, China ;2.Key Laboratory of Urban Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China
Abstract:
Abstract: To estimate the contribution of volatile organic compounds in summer and autumn to the formation potential of ozone and secondary organic aerosols, the concentration and speciation of VOCs at downtown and suburban stations in Chongqing urban area were measured and analyzed from August 22nd to September 23rd, 2015, using on-line GC-MS/FID. The results showed that the total volatile organic compounds (φ(TVOCs)) were 41.35×10-9 at the downtown station and 22.72×10-9 at the suburban station. The main components of VOCs at the downtown station were alkanes (35.2%) and alkene+alkynes (22.5%), while at the suburban station they were OVOCs (30.6%) and alkanes (26.0%). Maximum incremental reaction (MIR) analysis was used to estimate ozone formation potential (OFP) of VOCs. The results showed that the calculated OFPs were 149.11×10-9 at the downtown station and 71.09×10-9 at the suburban station. Ethylene, propene, toluene and C8-C9 aromatics were the major contributors to ozone formation at the downtown station, while acrolein, isoprene and MVK were the major contributors at the suburban station. Fractional aerosol coefficients (FAC) were also used to estimate the formation potential of secondary organic aerosols (SOA). The SOA concentrations at the downtown station and the suburban station were 0.36 μg/m3 and 1.26 μg/m3, respectively, which were lower than those in other cities of China. High-C alkanes including methylcyclohexane, n-nonane, n-decane and udecane played dominant roles in SOAP, as well as aromatics including toluene, benzene, ethylbenzene and C8 aromatics. The research indicated that the control of alkenes+alkynes and aromatics would be favorable for control of ozone formation, while the control of high-C alkanes and aromatics would contribute to the control of secondary organic aerosol formation.
Key words:  volatile organic compounds (VOCs)  ozone formation potential (OFP)  secondary organic aerosols (SOA)