嘉善夏季典型时段大气VOCs的臭氧生成潜势及来源解析

2016年8—9月对长三角南部区域嘉善的大气中挥发性有机化合物(VOCs)变化特征、臭氧生成潜势、臭氧生成控制敏感性和来源进行了研究。结果表明,观测期间VOCs总平均值为27.3×10-9,表现为烷烃卤代烃含氧有机物芳香烃烯烃炔烃;VOCs浓度变化较大,早晚出现峰值,与风速呈负相关的关系,与温度没有明显相关性。VOCs的臭氧生成潜势表现为芳香烃烯烃烷烃含氧有机物卤代烃炔烃。甲苯等10种物质对臭氧生成潜势的贡献达到63%。夏季典型时段臭氧生成对VOCs较敏感,属于VOCs控制区。观测期间测得对VOCs浓度贡献较大的物种来源于溶剂涂料和工业排放。

Ozone Formation Potential and Sources Apportionment of Atmospheric VOCs during Typical Periods in Summer of Jiashan

The changing characteristics, ozone formation potential, the sensitivity of ozone formation control and sources of volatile organic compounds (VOCs) were measured at Jiashan county from August to September in 2016. The results showed that total average concentration of VOCs observed was 27.3×10^-9, while alkane > Halogenated hydrocarbon > OVOC > aromatics > alkene > alkyne; Concentration of VOCs peaked at morning and afternoon with large variations during the daytime, which had negative relationship with wind speed. Ozone formation potential of VOCs appeared as aromatics > alkene > alkane > OVOC > Halogenated hydrocarbon > alkyne. The contribution of 10 key VOCs species including toluene to OFP was up to 63%. The ozone formation was more sensitive to VOCs during typical periods in summer, so it can be concluded that Jiashan was belonged to the VOC-sensitive region. The most contributive sources to VOCs were mainly from solvent coatings and industrial emissions.