泰州市环境空气中挥发性有机物分布特征

于2018年4—9月对泰州市环境空气中挥发性有机物(VOCs)组分开展现场观测,结合观测数据分析该市大气中VOCs的时空分布特征。结果表明:观测期间泰州市环境空气中VOCs平均摩尔比为45.1 nmol/mol,其中含氧挥发性有机物占比为57.8%;受周边排放源和地理位置影响,下风向点位的VOCs测定值高于其他点位;VOCs月均最高值出现在6月,与臭氧月均最高值出现时间一致,7—9月气团出现老化,导致臭氧生成能力减弱;观测期间VOCs中甲苯/苯(T/B)比值范围为0.2019~5.1303,且大部分T/B比值>2,说明溶剂、油气和液化石油气挥发等排放源对泰州市环境空气中VOCs的影响较为显著。

Distribution Characteristics of Volatile Organic Compounds in the Ambient Air of Taizhou

The components of volatile organic compounds(VOCs)in the ambient air of Taizhou were monitored through April to September,2018.Based on the monitoring data,the spatial and temporal distribution characteristics were analyzed.The results showed that the average concentration of VOCs was 45.1 nmol/mol.The proportion of oxygen-containing VOCs was the highest,reaching to 57.8%.Affected by surrounding emission sources and geographic location,the concentrations of VOCs at downwind sites were higher than those at other sites.The highest monthly mean concentration of VOCs occurred in June,which was consistent with the highest monthly mean concentration of ozone.From July to September,air mass aging resulted in weak ozone production.During the monitoring period,T/B ratio ranged from 0.2019 to 5.1303,mostly over 2,indicating that volatile solvents,oil gas and LPG were the main contributors to VOCs in the ambient air of Taizhou.