中文摘要：

利用2010年8月采集的南京北郊气溶胶样品,使用GC-MS对美国环保总局推荐的16种优先控制的多环芳烃含量、分布特征进行了研究。在此基础上,用特征比值法、主因子分析法分析得到南京市北郊大气中PAHs的主要来源为车辆尾气、燃煤、天然气和草木秸秆燃烧,并应用绝对因子分析法进一步定量计算主要源对PAHs的浓度贡献率。结果表明：1）大气颗粒物中16种多环芳烃的平均总质量浓度为135.85 ng/m~3,多环芳烃以4环为主,在可吸入颗粒物中的浓度占总浓度的88.7%;2）PM10中多环芳烃呈双模态分布,在9~10μm的粗模态和0.65~1.10μm的积聚模态上各出现一个峰值;3）天然气等对PAHs的贡献率为5.7%~44.1%,燃煤源的贡献率为20.7%~57.8%,汽车尾气的贡献率为4.6%~46.7%,木材燃烧的贡献率为2.9%~38.1%。本地交通排放和燃料燃烧是南京北郊大气颗粒物中PAHs的主要来源,远距离输送也对南京北郊气溶胶中的PAHs有重要贡献。

英文摘要：

Using the aerosol samples taken in August 2010 in the north suburb of Nanjing, the contents and distribution characteristics of 16 kinds of polycyelic aromatic hydrocarbons （PAHs） were analyzed using gas chromatography with mass selective detection （ GC - MS）. Principal component analysis and characteristic ratio method were used to analyze the PAHs, and the four major sources were identified： vehicle emissions, coal combustion, natural gas combustion and plant combustion. The contribu- tions from the four major sources were measured in further quantitative calculation with absolutely principal component analysis. The results were as follows. 1 ） The average concentration of all the PAHs was 135.85 ng/m3 and PAHs with 4 rings were the main components, which accounted for 88.7%. 2）The particle size distribution was dual-modes with one peak at the range of 9--10 p,m and the other peak at the range of 0.65--1.10μm. 3 ）The natural gas combustion contributed 5.7%--44.1% of various PAHs, coal combustion 20.7%--57.8% , vehicle emissions 4.6%-- 46.7% , plant combustion 2.9% --38.1%. The local vehicle emissions and fuel combustion were the main sources of PAHs in PM10, long-range transport also had an important contribution to PAHs in north suburban area of Nanjing.