摘要
采用"GCMS/FID"在线分析方法,对广州市区2016年7月大气VOCs的污染特征及来源进行了研究,共检出了73种VOCs组分.结果表明,观测期间总VOCs的小时平均浓度为(118.83±79.40)μg·m^(-3),最高值为492.42μg·m^(-3),最低值为10.54μg·m^(-3).07:00左右TVOC浓度出现高峰,说明早高峰的机动车污染对该站点的VOCs具有较大贡献;14:00左右浓度最低,与光化学损耗相关;21:00~24:00间VOCs浓度又出现高值,可能和污染源排放或边界层压缩有关.运用PMF模型解析出VOCs的5个主要来源分别是:交通污染源、溶剂使用污染、加油站污染、植物排放和餐厨废气,其贡献分别为29.79%、26.61%、24.86%、9.91%、8.84%;白天交通废气源贡献最大,而中午植物排放的贡献也明显增大;夜间溶剂污染源和加油站污染源占比上升,为该时段VOCs的主要来源.
Atmospheric volatile organic compounds（VOCs） were measured in an urban area of Guangzhou on July 2016 using an online gas chromatography mass spectrometry/fire ion detector.Seventy-three VOCs were detected with an average concentration of（118.83 ± 79.40） μg·m（-3）,a maximum concentration of 492.42 μg·m（-3）,and a minimum concentration of 10.54 μg·m（-3） during the period.The peak value of the TVOC concentration appeared at about 07： 00 in the morning,indicating that motor vehicle pollution had a significant contribution at the site.The minimum value appeared at about 14： 00 in the afternoon,related to photochemical losses.High concentrations were also observed from 21： 00 to 24： 00,which was probably related to pollution emissions and boundary layer compression.Source analysis by PMF showed that the site was mainly affected by five VOC sources： vehicle exhaust,solvent use,fuel loss at fuel stations,plant emissions,and cooking exhaust,the contributions of which were 29.79%,26.61%,24.86%,9.91%,and 8.84%,respectively.Vehicle exhaust was the largest source of VOCs during the daytime,while the contribution of plant emissions increased significantly at noon.The contribution of solvent uses and fuel loss at fuel stations rose during the night and became the main source of VOCs until early morning.
作者
古颖纲
虞小芳
杨闻达
田智林
李梅
程鹏
GU Ying-gang;YU Xiao-fang;YANG Wen-da;TIAN Zhi-lin;LI Mei(Institute of Mass Spectrometer and Atmospheric Environment, Jinan University, Guangzhou 510632, China;Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution, Guangzhou 510632, China;Jinan University Institute for Environmental and Climate Research, Guangzhou 510632, China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2018年第6期2528-2537,共10页
Environmental Science
基金
国家自然科学基金项目(91644218)
国家重点研发计划项目(2017YFC0210100)
科技部科技支撑项目(2014BAC21B01)
广东省自然科学基金项目(2015A030313339)
关键词
雨季
广州市区
挥发性有机物
污染特征
来源解析
rainy season
Guangzhou City
volatile organic compounds（VOCs）
concentration characteristics
sources apportionment
