Institute of Healthy Jiangsu Development; the Collaborative Innovation Center for Cancer Personalized Medicine, and Priority Academic Program Development of Jiangsu Higher Education Institutions
目的 了解南京江宁大学城春季PM2.5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PM2.5采集。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（PAHs）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PM2.5日平均质量浓度为70.24 μg/m3。c[有机碳(OC)]/c[元素碳(EC)]比值集中于2.24~10.60，提示PM2.5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SO42-、NO3-和NH4+含量较高，PM2.5整体偏碱性。c(NO3-)/c(SO42-)平均比值为0.65，表明采样点PM2.5受煤炭燃烧等固定污染源的影响较大。中高环PAHs在PM2.5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PM2.5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 To understand the characteristics and source appointment of PM2.5 from Jiangning university town of Nanjing during Spring. Methods Ambient PM2.5 was collected from Jiangning campus of Nanjing Medical University from March 15th to May 31st in 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 appointment was conducted by ion balance analysis, diagnostic ratio method, principal component analysis (PCA), etc. Results The average daily concentration of PM2.5 was 70.24 μg/m3. 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 SO42-, NO3- and NH4+. The average ratio of c(NO3-)/c(SO42-) was 0.65, indicating a coal combustion source. PAHs with 4~6 benzene rings were 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 PM2.5 pollution is serious in the Jiangning university town of Nanjing and has a mixed fossil fuel combustion and automobile emissions source.