摘要
目的:了解南京江宁大学城春季PM_(2.5)的污染特征及来源。方法:2018年3月15日—5月31日在南京医科大学江宁校区进行PM_(2.5)采样。分别使用热光碳分析仪、离子色谱仪、气相色谱串联质谱仪和能量色散X射线荧光光谱仪测定滤膜中碳质组分、水溶性离子、多环芳烃(polycyclic aromatic hydrocarbon,PAH)和无机元素的含量。通过离子平衡分析、同分异构体比值法、主成分分析等方法进行源解析。结果:采样期间PM_(2.5)日平均质量浓度为70.24μg/m^(3)。c[有机碳(OC)]/c[元素碳(EC)]比值集中于2.24~10.60,提示PM_(2.5)来源于化石燃料燃烧,且受二次污染影响较大。水溶性离子中SO_(4)^(2-)、NO_(3)^(-)和NH4+含量较高,PM_(2.5)整体偏碱性。c(NO_(3)^(-))/c(SO_42-)平均比值为0.65,表明采样点PM_(2.5)受煤炭燃烧等固定污染源的影响较大。中高环PAH在PM_(2.5)中含量较高,主成分分析结果提示污染主要来源于化石燃料燃烧、机动车尾气排放。无机元素中Fe、Cl、K、Al和Zn占总质量的82.98%,主成分分析结果提示化石燃料燃烧、机动车尾气排放、工业排放以及土壤扬尘是其主要来源。结论:南京江宁大学城PM_(2.5)污染较为严重,受化石燃料燃烧和机动车尾气排放影响最大。
Objective:The current study aims to understand the characteristics and source apportionment of PM_(2.5)from Jiangning university town of Nanjing during spring.Methods:Ambient PM_(2.5)was collected from Jiangning campus of Nanjing Medical University between March 15thand May 31stin 2018.Thermal/optical carbon analyzer,ion chromatography,gas chromatography-mass spectrometer and energy dispersive X-ray fluorescence spectrometer were used to determine the concentration of carbonaceous components,water-soluble ions,polycyclic aromatic hydrocarbons(PAHs)and inorganic elements,respectively.Source apportionment was conducted by ion balance analysis,diagnostic ratio method,principal component analysis(PCA),etc.Results:The average daily concentration of PM_(2.5)was 70.24μg/m~3.The ratios of c[organic carbon(OC)]/c[elemental carbon(EC)]mainly were 2.24~10.60,indicating fossil fuel combustion source and secondary pollution.Water soluble ions mainly included SO_(4)^(2-),NO_(3)^(-)and NH4+.The average ratio of c(NO_(3)^(-))/c(SO_(4)^(2-))was 0.65,indicating a coal combustion source.PAHs with 4~6 benzene rings were the most abundant.The results of PCA suggested a mixed coal,petroleum combustion and automobiles emissions source.Fe,Cl,K,Al and Zn were predominant in inorganic elements.Coal and petroleum combustion,automobiles emissions,industrial emissions as well as soil dust contributed to inorganic elements.Conclusion:PM_(2.5)pollution is serious in the Jiangning university town of Nanjing.The main sources of PM_(2.5)were the fossil fuel combustion and automobile emissions.
作者
刘璐
朱欢欢
吉贵祥
袁琪
张正东
储海燕
LIU Lu;ZHU Huanhuan;JI Guixiang;YUAN Qi;ZHANG Zhengdong;CHU Haiyan(School of Public Health,Nanjing Medical University,Nanjing 211166;Nanjing Institute of Environmental Sciences,Ministry of Ecology and Environment,Nanjing 210042;Nanjing Municipal Center for Disease Control and Prevention,Nanjing 210003,China)
出处
《南京医科大学学报（自然科学版）》
CAS
北大核心
2023年第3期405-412,共8页
Journal of Nanjing Medical University(Natural Sciences)
基金
江苏省高校自然科学研究项目(15KJB330002)
健康江苏研究院项目。
关键词
PM_(2.5)
污染特征
源解析
南京江宁大学城
PM_(2.5)
pollution characteristics
source apportionment
Jiangning university town of Nanjing
作者简介
通信作者:储海燕,E-mail:chy_grape@njmu.edu.cn。
