佛山市大气VOCs污染特征及来源解析

Pollution Characteristics and Source Apportionment of VOCs in Foshan City

针对2021年4月在佛山市狮山镇的在线监测大气挥发性有机化合物(VOCs)的监测结果,分析了大气VOCs的浓度水平及化学组成、日变化特征、臭氧生成潜势(OFP)及来源解析。结果表明,监测期间佛山市大气VOCs共检出的55种组分总平均体积浓度为35.28×10^(-9),表现为烷烃>芳香烃>炔烃>烯烃;臭氧污染日VOCs呈现双峰分布的变化特征,早晚浓度较高,午间VOCs浓度较低;VOCs组分的总OFP为91.39×10^(-9),不同组分对总OFP的贡献率排序为芳香烃>烯烃>烷烃>炔烃;佛山市大气中VOCs的主要有6个来源,各源占比情况依次为:溶剂使用源>LPG排放源>机动车排放源>燃烧源>燃料挥发源>植物排放源。重点控制溶剂使用源的VOCs排放,同时加强LPG使用源与燃烧源的减排,将有利于本地区的臭氧污染控制。

Based on the monitoring results of volatile organic compounds(VOCs)in the atmosphere monitored online in Shishan Town,Foshan City in April 2021,the composition and concentration of VOCs,diurnal variation characteristics,ozone formation potential(OFP)and source apportionment of VOCs were analyzed.The results showed that the total average concentration of 55 VOCs detected in Foshan city was 35.28×10^(-9),which was in the order of alkane>aromatic hydrocarbon>alkyne>alkene.VOCs in ozone pollution days showed the characteristics of bimodal distribution,with higher concentration in the morning and evening and lower concentration in the afternoon.The total OFP of VOCs components was 91.39×10^(-9),and the contribution rate of different components to the total OFP was in the order of aromatic hydrocarbon>alkene>alkane>alkyne.There were mainly 6 sources of VOCs in the atmosphere of Foshan city,and the proportion of each source was in order:solvent use source>LPG emission source>motor vehicle emission source>combustion source>fuel volatilization source>plant emission source.It was beneficial to control ozone pollution in this region by focusing on VOCs emission control of solvent using sources and strengthening emission reduction of LPG using sources and combustion sources.