中文摘要：

用气相色谱-质谱法（GC-MS）定量分析了2013年9月南昌市PM（2.5）中16种优控多环芳烃（PAHs）含量.结果表明,PAHs总浓度平均值为17.95 ng·m-3,变化范围为3.55—39.97 ng·m-3.不同环数多环芳烃占总浓度比例由大到小依次为：5环（50.45%）〉4环（19.32%）〉6环（17.99%）〉2环（6.34%）〉3环（5.90%）,表现出明显的机动车尾气排放特征.通过计算PAHs的苯并[a]芘（BaP）毒性当量浓度（9.458—14.454 ng·m-3）,表明南昌市PAHs对人体健康存在潜在危害.特征化合物比值法和主成分分析法结果表明,燃煤、机动车尾气、农业燃烧及少量的石油挥发是南昌市PM（2.5）中PAHs的主要污染源.

英文摘要：

Sixteen polycyclic aromatic hydrocarbons（ PAHs） in PM（2.5）samples collected from Nanchang City in September 2013 were collected by gas chromatography-mass spectrometer（ GC-MS）. The average concentration of total PAHs was 17.95 ng·m~（-3）,with a range of 3.55—39.97 ng·m~（-3）. The percentages of different ring PAHs to the total PAHs concentration followed the descending order： 5-ring（ 50.45%） 4-ring（ 19.32%） 6-ring（ 17.99%） 2-ring（ 6.34%） 3-ring（ 5.90%）,which showed significant characteristics of vehicle exhaust emission. The risk of PAHs was calculated by Benzo[a]pyrene（ Ba P） equivalent（ 9.458—14.454 ng·m~（-3））,indicating PAHs had potential hazardous effects on human health in Nanch ang city. Diagnostics ratios and principal component analysis（ PCA） indicated that coal combustion,vehicle exhaust,agricultural burning and small amount of petroleum volatilization were the major sources of PAHs in PM（2.5）in Nanchang City.