摘要
该文应用开发的多组分类别、单次进样117种VOCs的检测方法对2021年4-12月广州郊区、中心城区和过渡区大气进行监测,对典型VOCs的污染特征、臭氧生成和来源进行分析。TVOCs的平均体积浓度为43.9×10^(-9),其中烷烃占35.5%,OVOCs占25.5%,芳香烃占11.2%,卤代烃占10.2%,烯+炔烃占8.2%,ODS占9.3%,浓度按中心城区-过渡区-郊区逐渐降低,但功能区组分特征基本一致,烷烃及烯+炔烃体积浓度较其他年份下降超29%,已接近京津冀背景站水平。监测期间TVOC、OFP高峰基本伴随O_(3)高值,相同的TVOC增量夏秋季对O_(3)的提升显著大于冬季。3个功能区OFP均值在178~276μg/m~3之间,过渡区最高,芳香烃类均贡献近51%的OFP。O_(3)污染/非污染期比对,筛选出7种优先控制组分:对+间二甲苯、甲苯、萘、邻二甲苯、异戊烷和正丁烷。特征比值、化合物同源线性和PMF解析均表明,广州VOCs的主要来源为机动车尾气排放和油品挥发(合计贡献54%),燃烧源占12.2%,石化工业占16.5%,溶剂源和植物排放各占约8%。
A multi-category analysis method for 117 VOCs analysis in single injection was applied to monitor ambient air in Guangzhou suburban,urban center,and transition areas from April to December 2021.The pollution characteristic,sources,and ozone formation of typical VOCs were analyzed.TVOCs arerage mixing ratio was 43.9×10^(-9) with compositional contri⁃butions from alkanes(35.5%),OVOCs(25.5%),aromatic hydrocarbons(11.2%),halo-hydrocarbons(10.2%),alkene+alkyne(8.2%)and ODS(9.3%).While TVOC concentrations exhibited a spatial gradient(central urban>transition zone>suburban areas),compositional profiles remained consistent.Alkanes and alkenes+alkynes decreased by 29%compared to historical lev⁃els,approaching background concentrations observed in the Beijing-Tianjin-Hebei Region.O_(3) buildup correlated with high TVOC and OFP,though the incremental effect of TVOC on O_(3) was significantly stronger in summer/autumn than in winter.The average OFP ranged from 178 to 276μg/m 3,peaking in transition zones,with aromatic hydrocarbons contributing 51%of OFP.Components comparison of O_(3) pollution/non pollution period screening out 7 priority control species:toluene,m/p-xylene,naphthalene,o-xylene,isopentane,and butane.The characteristic ratio,compound homology linearity and PMF analy⁃sis consistently indicated that the main sources of VOCs in Guangzhou were vehicle exhaust emissions and gasolines volatil⁃ization(contributed up to 54%),fuel accounted for 12.2%,petrochemical industry occupied 16.5%,solvents and plant emission each accounted about 8%.
作者
康美婷
谭嘉敏
刘菲妃
周志洪
张金谱
KANG Meiting;TAN Jiamin;LIU Feifei;ZHOU Zhihong;ZHANG Jinpu(Guangzhou Sub-branch of Guangdong Ecological and Environmental Monitoring Center,Guangzhou 510006,China)
出处
《环境科学与技术》
北大核心
2026年第1期222-234,共13页
Environmental Science & Technology
基金
广州科技计划项目(202102080679)。
关键词
VOCS
污染特征
来源
臭氧
广州
VOCs
pollution characteristics
sources
ozone
Guangzhou
