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2019年夏季常州市挥发性有机物加密监测污染特征分析
王振
江苏省常州环境监测中心
摘要:
2019年8月至9月,在常州市三个监测点开展了为期49天的环境空气57种VOCs离线加密观测,分析VOCs浓度水平及组成特征。结果表明,洛阳小学、市监测站和武澄工业园VOCs的平均浓度分别为29.8×10-9、20.8×10-9和25.3×10-9。三个测点中烷烃的浓度均最大,洛阳小学、市监测站和武澄工业园烷烃浓度占比依次为59.1%、57.2%和51.4%,烷烃中均以乙烷、丙烷和正丁烷浓度最大。应用臭氧生成潜势、OH自由基的消耗速率和二次有机气溶胶生成潜势分别对三个站点分别进行计算,计算结果显示各测点芳香烃臭氧生成潜势、OH自由基的消耗速率和二次有机气溶胶生成潜势均最大,各测点芳香烃臭氧生成潜势占比为67.1%~68.0%、OH自由基的消耗速率占比为45.4%~52.0%和二次有机气溶胶生成潜势占比为93.3%~94.7%,芳香烃中关键活性组分是甲苯、乙苯和二甲苯等。上风向的洛阳小学与武澄工业园VOCs浓度比位于市区的市监测站比较高,相应的臭氧生成潜势和二次有机气溶胶生成潜势均高于市区,表明上风方向VOCs排放对市区影响较大。
关键词:  常州市区  挥发性有机物  臭氧生成潜势  二次有机气溶胶生成潜势
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基金项目:常州市大气PM2.5和臭氧复合污染形成机制研究
Pollution characteristics analysis of volatile organic compounds intensive monitoring in Changzhou in the summer of 2019
Abstract:
In order to study the concentration and composition characteristics of ambient volatile organic compounds (VOCs) in Changzhou, 57 ambient VOCs species were measured at 3 sites for 49 days by offline densified observation from August 2019 to September 2019. The results showed that the average concentrations of VOCs at Luoyang Primary School, Municipal Monitoring Station and Wucheng Industrial Park were 29.8 × 10-9, 20.8 × 10-9 and 25.3 ×10-9, respectively. The concentrations of alkanes were the highest in all sites,in which ethane, propane and n-butane accounted the most, the percentages of alkanes at Luoyang Primary School, Municipal Monitoring Station and Wucheng Industrial Park were 59.1%、57.2% and 51.4%, respectively. OFP (ozone formation potential )、 LOH(OH consumption rate)and AFP (secondary?organic aerosol formation potential) were applied to assess reactivity of ambient VOCs. The calculation results showed that aromatics contributed the largest parts of the total OFP、LOH and AFP at each site, the corresponding percentages were 67.1%~68.0%、45.4%~52.0% and 93.3%~94.7% among 3 sites, respectively; toluene, ethylbenzene and xylene were the key active components in aromatics. The concentrations of VOCs on upwind sites-Luoyang Primary School and Wucheng Industrial Park were higher than that on urban site-Municipal Monitoring Station, as well as the OFP and AFP, indicating that the VOCs emissions from the upwind had a great impact to the urban area.
Key words:  Changzhou  urban, VOCs, OFP, SOAP