大气VOCs在线监测及来源解析技术应用探讨

Discussion on the Application of the On-line Monitoring and Source Analysis Technology for Atmospheric VOCs

挥发性有机物(VOCs)在臭氧生成中起着关键作用。通过分析2018年8月19日至22日在湖南省某地区开展的VOCs在线连续监测发现,VOCs浓度大小依次表现为烷烃>烯烃>芳香烃。进一步分析相关VOCs的臭氧生成潜势(OFP)得知,芳香烃、烯烃是臭氧生成的主要贡献源。利用正交矩阵因子模型(PMF)对VOCs进行来源解析,结果显示在监测期间涂料和溶剂使用、汽油车尾气排放为两大主要的污染源,结合风向分析,污染源主要来自监测点位西南方向的汽车产业园和高速公路车流。

Abstact: Volatile organic compounds(VOCs) play a key role in ozone formation. An online continuous monitoring of VOCs was carried out in a certain area in Hunan Province during August 19-22, 2018, and it was found that the concentrations of VOCs were sorted in descending order by concentration: alkenes > olefins > aromatic hydrocarbons. A further analysis of the ozone formation potential(OFP) of related VOCs showed that aromatic hydrocarbons and olefins were the main contributors to ozone formation. The source apportionment of VOCs was analyzed by using the positive matrix factorization(PMF) model. The results showed that the use of paints and solvents and the exhaust emissions from gasoline vehicles were two major pollution sources during the monitoring period. Combined with the analysis of wind direction, the pollution sources could have mainly come from the automobile industrial park and the traffic flow on the expressway to the southwest of the monitoring point.