| 厦门春季 PM10中PAHs成分谱特征及其与气象要素相关性分析 |
| 摘要点击 3158 全文点击 1379 投稿时间：2014-07-30 修订日期：2014-11-29 |
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| 中文关键词 多环芳烃 粒径分布 诊断参数 来源分析 气象要素 |
| 英文关键词 PAHs size distribution diagnostic ratios source apportionment meteorological element |
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| 中文摘要 |
| 为了研究厦门春季市区与郊区PM10中 PAHs的污染状况和分布特征,利用 GC-MS分析了 2013年 4月 11~21日日间和夜间分别在厦门市、郊两地采集的气溶胶样品,并得到了厦门市区和郊区 18种 PAHs的浓度,研究得出厦门郊区ΣPAHs昼夜变化比市区小,市区的白天是夜间的 1.83倍,并且 PAHs的浓度仍然是低于国家的环境标准的. 在不同的时间和空间尺度下,ΣPAHs均呈双峰型分布,市区和郊区昼、夜的 PAHs组分均以中低环 PAHs为主,高环 PAHs随着粒径的增大而逐渐减小,而低环 PAHs所占比例逐渐增大,市区的 PM10中 2~4环 PAHs粒径的昼、夜分布有很大差异,而 5~7环差异不大. 并用 DR方法分析了 PAHs的来源,得出厦门春季市区和郊区 PAHs的主要贡献源为汽油、柴油的燃烧和冶炼厂的熔炉排放的废气. 在采样期间,郊区ΣPAHs浓度与温度、风向呈负相关关系,与能见度和风速呈正相关关系,而市区的ΣPAHs浓度除白天与温度的相关性跟郊区相同外,与其他气象要素的相关性和郊区基本相反. |
| 英文摘要 |
| In order to study pollution status and distribution characteristics of PAHs in PM10 during the spring in city and suburban Xiamen. A total of 18 PAHs were analyzed in the aerosol samples collected in daytime and nighttime during 11th to 21st of April, 2013 in city and suburban Xiamen. Results showed diurnal variation of ΣPAHs in suburban was weaker than that in city. In the city, the concentration of PAHs during daytimes was higher than that during nighttimes, close to 1.83 times, and it is still under the national environmental standards. In different times and space scales, PAHs were a bimodal distribution, the components of PAHs gave the priority to low and middle rings in urban and suburban during daytimes and nighttimes. PAHs with high molecular weight decreased gradually by the increase of particle size, and the proportion of low molecular weight PAHs increased gradually in the meantime. In the city, the change of size distribution among 2-4 rings PAHs in PM10 during days and nights was bigger than these among 5-7 rings. The main sources of PAHs were estimated by DR, the main contributions included gasoline and diesel combustion, the smelting furnace exhaust emissions.During sampling periods, the relationship between the concentration of PAHs, temperature and WD is negative, PAHs had a positive correlation with the visibility and WS in suburban. And in urban, the relationship with temperature during the day was negative, and with an opposite correlation between other meteorological elements. |
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