【作者】 王格慧； 牛红云； 戴朝霞； 赵欣； 王连生；

【Author】 Wang Gehui Niu Honghyun Zhaoxia Dai Xin Zhao Liansheng Wang School of the Environment, Nanjing Univerisity, Nanjing, 210093

【机构】 南京大学环境学院；

【摘要】 本文运用大流量采样器采集了南京市五个不同功能区大气气溶胶PM10和PM2.5,对气溶胶中的正构烷烃和多环芳烃进行了化学表征,研究其污染水平和污染特征。实验结果表明:南京市大气污染是相当严重的,其中,PM10中正构烷烃的浓度为53.6-733 ng m-3,PM2.5中正构烷烃的浓度为39.1-709 ng/m-3;PM10中多环芳烃的浓度为14.4-413 ng/m-3,PM2.5中多环芳烃的浓度为7.86-272 ng/m-3。五个不同功能区中,交通干道区污染最为严重,其次是商贸饮食区,居民生活区、工业区和风景旅游区大气污染程度相近。南京市大气气溶胶中正构烷烃矿物燃料的燃烧,五个不同功能区大气气溶胶PM10中11.8-16.9%的正构烷烃来源于生物源,而PM2.5中10.8-15.6%的正构烷烃来源于生物释放源,而南京市大气气溶胶中多环芳烃主要来源于柴油和煤的燃烧。更多还原

【Abstract】 A comprehensive campaign was performed from 2001 to 2002 in the five locations of Nanjing urban area in order to understand the state, characteristics and sources of the air pollution. In this study 18 n-alkanes (C15-C32) and 15 PAHs in PM10 and PM2.5 aerosols were chemically characterized by GC and GC/MS. The potential sources of pollutants were reconciled using CPI values and diagnostic ratios of PAHs. The total content of n-alkanes in PM10 ranged from 53.6 to 733 ng m-3, and the total content of n-alkanes in PM2.5 ranged from 39.1 to 709 ng m-3. The concentration of total PAHs ranged from 14.4 to 413 ng m-3 for PM10 and from 7.86 to 272 ng m-3 for PM2.5. Both total contents of n-alkanes and PAHs presented the highest levels in the traffic center, which coincided with the spatial distribution of the particle mass. The CPI values and the diagnostic ratios of PAHs indicate that combustions of diesel and coal are the most important sources of the organic aerosols in Nanjing urban area.更多还原