摘要
本研究于2019年11月19日至2019年12月24日在太原盆地某县城利用大气颗粒物有机碳、元素碳在线分析仪对PM_(2.5)中有机碳(OC)、元素碳(EC)进行了在线监测,分析其污染特征及来源。结果显示,研究期间OC、EC的平均质量浓度为21.26μg/m^(3)和9.72μg/m^(3),分别占PM_(2.5)的21.94%和10.03%.利用Cabada法估算了研究期间二次有机碳(SOC)平均质量浓度为6.80μg/m^(3),对OC的贡献率为31.98%.OC和EC的日变化在上午11时左右出现浓度峰值,这主要是由于燃煤及机动车影响加剧造成的;凌晨0~2时OC/EC值较大,且SOC、OC出现浓度峰值,说明此时二次源对碳质气溶胶影响较大。相关性分析显示,该地区冬季OC和EC来源大致相同,都是以一次排放为主。OC、EC、SOC与SO_(2)的相关性均高于NO_(2)和CO,表明燃煤对OC和EC贡献比机动车尾气更加显著。
In this study,the concentrations of organic carbon(OC) and elemental carbon(EC) in PM_(2.5 )were measured using an online OC/EC analyzer during the period from November 19,2019 to December 24,2019 in a county of Taiyuan Basin,the pollution characteristics and sources of OC and EC were analyzed.The results showed that the average mass concentrations of OC and EC were 21.26 μg/m^(3) and 9.72 μg/m^(3),accounting for 21.94% and 10.03% of PM_(2.5),respectively.Based on the Cabada method,,the average concentration of secondary organic carbon(SOC) during the study period was 6.80 μg/m^(3) and contributed 31.98% of OC.The diurnal variations of OC and EC concentrations showed the peak value at about 11 am,which was mainly caused by the increasing influence of coal burning and motor vehicles.OC/EC and the concentrations of SOC and OC showed the peak value during the period from 0 to 2 am,indicating that secondary sources had a great influence on carbon aerosol.Correlation analysis showed that the sources of OC and EC in winter were almost the same and were dominated by primary emissions.The correlations between OC,EC,SOC and SO_(2) were higher than NO_(2) and CO,indicating that the contribution of coal burning to OC and EC was more significant than that of motor vehicle exhaust.
作者
韩朋
田晓
郭利利
崔阳
李宏艳
何秋生
王新明
HAN Peng;TIAN Xiao;GUO Li-li;CUI Yang;LI Hong-yan;HE Qiu-sheng;WANG Xin-ming(College of Environment and Safety,Taiyuan University of Science and Technology,Taiyuan 030024,China;State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510630,China)
出处
《太原科技大学学报》
2022年第2期103-108,共6页
Journal of Taiyuan University of Science and Technology
基金
国家自然科学基金(42077201)
国家生态环境部攻关项目(DQGG202107)
太原科技大学博士启动基金(20202072)。
关键词
PM_(2.5)
碳质组分
有机碳
元素碳
相关性分析
PM_(2.5)
aerosol carbonaceous component
organic carbon
elemental carbon
correlation analysis
