【摘要】 采集北京城乡结合区和郊区冬季12个大气可吸入颗粒物不同粒径样品,用色谱-质谱技术分析鉴定了75种多环芳烃化合物,并对各粒径中美国EPA优控的16种多环芳烃做了定量分析,研究其在不同粒径的分布规律。结果表明:城乡结合区大气颗粒物中优控多环芳烃总量明显高于郊区;郊区和城乡结合区大气分别有68%和85%的优控多环芳烃吸附在粒径小于2 0μm颗粒物上;可吸入颗粒物中都相对富集高环数的多环芳烃;2个地区主要污染源可能为化石燃料的燃烧排放,燃煤的影响相对较大。更多还原

【Abstract】 Twelve size segregated particulate samples in inhalable particles from urban-rural transition site and suburban site in Beijing in the winter are collected. Seventy-five polycyclic aromatic hydrocarbons (PAHs) are identified. U.S. EPA 16 priority PAHs are quantitatively analyzed by GC-MS and its size distribution characteristics also discussed. The result shows that the concentration of PAHs in inhalable particles at urban-rural transition sites is higher than that at suburban sites. About 68% and 85% of priority PAHs are adsorbed on particles smaller than 2.0 μm at suburban site and urban-rural transition site respectively. PAHs with more than four rings are enriched in inhalable particles at the two sites. The major pollution source is possibly combustion of fossil fuel and influence from coal combustion is predominant.更多还原