| 福州城市及郊区冬、夏两季大气中多环芳烃特征研究 |
| 摘要点击 2781 全文点击 1280 投稿时间：2012-06-20 修订日期：2012-08-06 |
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| 中文关键词 多环芳烃 大气 冬夏 城郊 来源分析 |
| 英文关键词 polycyclic aromatic hydrocarbons (PAHs) atmosphere winter and summer urban and suburban source analysis |
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| 中文摘要 |
| 2010年冬、夏两季,利用大流量采样器和气相色谱-质谱联用仪(GC-MSD),分析了福州市大气中多环芳烃(PAHs)的浓度水平、分布特征及来源. 结果表明,福州城郊冬、夏两季大气(颗粒相+气相)中∑PAHs浓度范围分别为115.45~187.76 ng·m-3和45.55~59.20 ng·m-3,整体而言,气相显著高于颗粒相,冬季高于夏季; 冬季城区高于郊区,夏季城区则低于郊区,但城郊区差异不显著; 气相中PAHs比例夏季高于冬季. 整体而言,气相中PAHs主要以2~4环化合物组成,颗粒相中则以4~6环化合物为主. 冬季气相中PAHs主要以3环化合物为主,夏季主要以3环和4环化合物为主; 颗粒相中PAHs组成无明显的季节特征. 毒性当量因子法分析表明福州市空气质量状况总体良好. 来源解析表明,福州大气PAHs主要为燃烧源,福州机动车燃料以柴油为主. |
| 英文摘要 |
| Air samples from four sampling sites in urban and suburban in Fuzhou were collected by Hi-vol air samplers in winter and summer in 2010, and concentrations of PAHs were analyzed by GC-MSD. The total (particle and gas phase) PAHs concentrations in ambient air were in the range of 115.45-187.76 ng·m-3in winter and 45.55-59.20 ng·m-3 in summer. PAHs in the gas phase were significantly higher than those in the particle phase, and PAHs in winter were higher than those in summer. No significantly difference was found between urban and suburban, with little higher PAHs in urban in winter and lower PAHs in summer. The ratios of PAHs in the gas phase to particle phase in summer were significantly higher than those in winter. The 2-4 rings PAHs were the dominant components in the gas phase while PAHs in the particle phase were dominated by 4-6 rings. The 3 rings PAHs were the dominant components in the gas phase in winter while 3 and 4 rings in summer. No significantly seasonal trends of PAHs components were found in the particle phase. The toxic equivalence factor (TEF) assessment showed that the pollution of PAHs in Fuzhou city was at a low level. Source analysis indicated that PAHs mainly came from combustion and diesel fuel was the predominant fuel in Fuzhou. |
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