北海市一次特殊臭氧污染过程调查研究
Study on a Special Ozone Pollution Process in Beihai City
马韵 1韦业 1吴欣1
作者信息
- 1. 广西壮族自治区北海生态环境监测中心,广西 北海 536000
- 折叠
摘要
对2022年 5月 4-5 日北海市环境空气发生的一次臭氧污染过程进行调查研究.结果显示:ρ(O3)日最大 8 h滑动平均值区域分布极不均衡,最高点为 172.0 μg/m3,最低点为 120.0 μg/m3.54 种有机物VOCs检测出苯、1,2-二氯丙烷、甲苯、乙苯、间二甲苯(对二甲苯)和 1,2,4-三甲基苯等 6 种,浓度水平为 0.4～3.2 μg/m3,其余 48种未检出.利用平行样品进行定性分析,另有乙腈、正己烷、1,3-二氯丙醇、2,6-二叔丁基甲酚和葵醛等 7 种有机物被检出.ρ(NO2)与ρ(O3)相关性分析表明,污染日发生期间,昼间时间存在明显ρ(NO2)下降,而ρ(O3)急剧上升的现象,二者为高度负相关.而夜间时间二者为中度负相关.利用HYSPLIT后向轨迹追踪气团来源,其 1 000m轨迹所经过的城市,也存在ρ(O3)超标现象,提示臭氧污染存在相互传输的作用.
Abstract
An ozone pollution process in beihai city on May 4-5,2022 was investigated.The results show that the 8-hour average of O3 is unevenly distributed,with the highest point being 172.0μg/m3 and the lowest point being 120.0μg/m3.VOCs qualitative and quantitative analysis of 54 organic compounds,detected benzene,1,2-dichloropropane,toluene,ethylbenzene,m-xylene(p-xylene),1,2,4-trimethylbenzene,concentration level of 0.4～3.2μg/m3,the other 48 organic compounds were not detected.By qualitative analysis of parallel samples,seven organic compounds including acetonitrile,n-hexane,1,3-dichloropropanol,2,6-ditert-butylcresol and aldehyde were detected.The correlation analysis between nitrogen dioxide and ozone showed that during the pollution days,there was a significant decrease of nitrogen dioxide concentration in daytime and a sharp increase of ozone,and there was a high negative correlation between the two,and a moderate negative correlation between the two at night.HYSPLIT backward track was used to trace the source of air mass,and the cities with 1 000 m tracks also had ozone exceeding to the standard,suggesting that ozone pollution was transmitted through each other.
关键词
臭氧/臭氧污染/臭氧前体物/有机物/二氧化氮/调查研究Key words
ozone/ozone pollution/ozone precursors/organics/nitrogen dioxide/investigation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据