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北京地区表土中多环芳烃的源解析

Keywords: 多环芳烃,表土,因子分析,多元线性回归,北京

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Abstract:

采用网格法均匀布点采集了北京地区161个表土样品,测定了其中15种多环芳烃(PAHs)的浓度。利用因子分析-多元线性回归法解析出北京地区表土中PAHs的3种来源,并定量计算了3种源的贡献量。结果表明,北京地区表土中PAHs的特征污染源为煤炭燃烧/交通排放、焦炉及石油,3种源基于多元线性回归法的贡献率分别为48%、28%和24%,对15种PAHs总量的贡献量均值分别为16.36、4.63和3.70μg·kg-1。燃煤/交通源表现为市中心源强高于郊区,焦炉源在大部分区县中存在单一高值点,石油源在市中心及五环外环带呈点状分布。据此推断,北京地区PAHs的源贡献与北京地区能源结构和功能区划有关,能源结构和功能区划的改善是控制北京地区表土中多环芳烃的有效途径。

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