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南通市大气VOCs四季变化特征和臭氧生成潜势分析
李敏娜
江苏省南通环境监测中心
摘要:
2019年1月1日-12月31日,在南通市区采用TH-300B对57种大气挥发性有机物(VOCs)开展在线观测,对比分析了南通四个季节VOCs组成、季节变化特征、季节日变化规律,并用最大增量反应活性(MIR)估算了VOCs的臭氧生成潜势(OFP),找到了南通市VOCs的优控物种。结果表明:南通市2019年TVOCs平均体积浓度为15.57ppb,不同类别体积浓度排名为:烷烃(9.65ppb)>芳香烃(2.85ppb)>烯烃(1.84ppb)>炔烃(1.23ppb)。总体表现为冬季高夏季低。和国内其他城市比较,南通市TVOCs和各组分体积浓度处于较低水平。烯烃和炔烃四季均呈现较明显的双峰分布,峰值位于7:00-8:00和19:00-21:00,烷烃四季均呈现较明显的单峰分布,峰值位于6:00-8:00。芳香烃四个季节变化趋势有所不同。烷烃和芳香烃夜间浓度均高于白天浓度。臭氧生成潜势均值为108.17μg/m3,冬季(122.70μg/m3)>春季(116.15μg/m3)>秋季(111.26μg/m3)>夏季(82.58μg/m3)。南通市VOCs的优控物种为丙烷、乙烯、异戊烷、甲苯、间/对二甲苯,控制南通市区臭氧排放的首要任务是控制机动车排放、加油站油气挥发和溶剂使用。
关键词:  挥发性有机物(VOCs)  臭氧生成潜势(OFP);季节变化;优控物种
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基金项目:江苏省环保专项资金资助项目(PM2.5、臭氧及其前体物监测体系、质控质保体系研究及示范应用)
Seasonal variation characteristics of atmospheric VOCs and potential analysis of ozone generation in Nantong City
Abstract:
We used TH-300B to sample 57 kinds of atmospheric volatile organic compounds (VOCs) to conduct online observation and analysis of the four seasons of VOCs in Nantong from January 1 to December 31 of the year of 2019.We contrast nantong seasonal variation characteristics, seasonal variation, and we used the biggest increment reactivity (MIR) to calculate the ozone generating potential of VOCs (OFP), Nantong VOCs optimal control of the species were found. The results showed that the average volume concentration of TVOCs in Nantong in 2019 was 15.57ppb, and the volume concentration ranking of different categories was: alkane (9.65 ppb) > aromatic hydrocarbon (2.85 ppb) > alkenes (1.84 ppb) >alkynes (1.23 ppb). The overall performance is high in winter and low in summer. Compared with other cities in China, the volume concentration of TVOCs and its components in Nantong is at a low level. The alkenes and alkynes showed obvious bimodal distribution in four seasons, with the peak at 7:00-8:00 and 19:00-21:00, and the alkanes showed obvious unimodal distribution in four seasons, with the peak at 6:00-8:00. The four seasonal variation trends of aromatic hydrocarbon are different. The concentrations of alkane and aromatics were higher at night than at day. The average potential of ozone formation was 108.17 μg/m3 in winter (122.70μg/m3) > in spring (116.15μg/m3) > in autumn (111.26μg/m3) > in summer (82.58μg/m3). The optimal control of species are propane, ethylene, isopentane, toluene and m-paraxylene. The primary task of ozone emission control in Nantong urban area is to control vehicle emission, gas volatilization and solvent use in gas stations.
Key words:  Volatile organic compounds (VOCs)  Ozone generation potential (OFP)  Seasonal changes  Optimal control of species