上海市环境空气VOCs在线监测关键物种的识别研究

A Study of Online Ambient Air Monitoring in Shanghai:Identification of VOCs Key Species

该文以上海市6个环境空气监测站2020年57个PAMS物种在线监测数据为基础,依托国家现有质控质保技术方法,通过正向筛选和逆向验证的手段,筛选并确认了上海市环境空气VOCs在线监测的关键物种。首先通过单站点和站点间逐级筛选关键物种17个,然后经年均浓度和OFP占比验证其适用性,再结合监测经验和基础数据补充关键物种2个,最终识别出3-甲基戊烷、异戊烷、正戊烷、环己烷、正己烷、异丁烷、正丁烷、丙烷、乙烷、乙烯、丙烯、异戊二烯、乙炔、间/对-二甲苯、邻-二甲苯、甲苯、乙苯、苯共计19个关键物种。研究成果可为生态环境管理部门对VOCs在线监测的质控质保工作提供分类管理的依据。

On the basis of online monitoring data which involved 57 species of PAMS collected from six ambient air monitoring stations in Shanghai in 2020, and the related national quality control and quality assurance technology methods, the key VOCs species for online monitoring of ambient air in Shanghai were screened and confirmed by means of forward screening and reverse validation. The process was as follows: firstly, 17 key species were screened in each individual station and step-by-step among the stations;secondly, the applicability was verified by annual average concentration and the determination of OFP(ozone formation potentials) proportion;thirdly, two key species were supplemented based on monitoring experience and basic data;and finally, 19 key species were identified, including 3-methylpentane,isopentane, n-pentane, cyclohexane, n-hexane, isobutane, n-butane, propane, ethane, ethylene, propylene, isoprene, acetylene,m & p-xylene, o-xylene, toluene, ethylbenzene and benzene. In general, the key species confirmed could reflect the VOCs pollution characteristics of ambient air in Shanghai. The results of the study provided a basis of classification management for the ecological environmental management department in terms of the quality control and quality assurance of online monitoring of VOCs.