盐城市城区NMHCs浓度特征、化学活性及来源分析  

Concentration Characteristics,Chemical Activity and Source Analysis of NMHCs in Yancheng City

作　　者：李云飞 孙红梅 沐存芳 李霆 咸月 LI Yun-fei;SUN Hong-mei;MU Cun-fang;LI Ting;XIAN Yue(Jiangsu Yancheng Environmental Monitoring Center,Yancheng 224002,China)

机构地区：[1]江苏省盐城环境监测中心,江苏盐城224002

出　　处：《环境科技》2022年第5期58-64,共7页Environmental Science and Technology

基　　金：江苏省PM2.5与臭氧协同控制重大专项(2019023)。

摘　　要：为了解盐城市城区大气中非甲烷碳氢化合物(NMHCs)的浓度水平和变化形式,使用离线采样系统地对盐城市环境监测中心、盐城电厂、盐塘河公园、亭湖区政府4个采样点位环境空气NMHCs的浓度水平、组分特征、光化学活性及来源进行监测并开展对比研究。研究结果表明:2021年4月~10月盐城市城区NMHCs平均体积分数为8.96×10^(-9),各采样点NMHCs组分比例相似,主要成分为烷烃,所占比例均超过60%,其次为芳香烃和烯烃,炔烃所占比例最小。NMHCs中1,3,5-三甲基苯的光化学反应活性最强。监测期间NMHCs浓度主要贡献来源于机动车尾气排放、生物质燃烧和溶剂挥发。To understand the concentration level and variation pattern of non-methane total hydrocarbons(NMHCs)in the atmosphere of Yancheng urban area,off-line sampling was used to systematically compare the concentration levels,component characteristics,photochemical activities and sources of NMHCs in the ambient air at four sampling sites:Yancheng environmental monitoring center,Yancheng power plant,Yantanghe park,and Tinghu district government.The research results show thatthe average volume fraction of NMHCs in Yancheng city was 8.96×10^(-9)from april to october of2021.The components of NMHCs at each sampling point are roughly similar,and the main component is alkane,accounting for more than 60%,followed by aromatic hydrocarbons and alkene,with the smallest proportion of alkynes.1,3,5-trimethylbenzene has the strongest photochemical reactivity among NMHCs.The main contributions of NMHCs concentrations during the monitoring period come from vehicle exhaust emissions,biomass combustion and solvent volatilization.

关 键 词：盐城 NMHCS 浓度特征 光化学反应活性 来源 

分 类 号：X8[环境科学与工程—环境工程]