燃煤电厂土壤中多环芳烃污染特征及其源解析
Pollution characteristics and source analysis of polycyclic aromatic hydrocarbons in soil of coal fired power plant
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摘要: 本研究以美国环境保护署(USEPA)优控的16种多环芳经(PAHs)为研究对象,对我国西南某地燃煤电厂采集的10个土壤样品,用气相色谱-质谱联机方法(GC-MS)测定样品PAHs含量,分析PAHs含量特征及其变化规律,在此基础上以污染物源解析方法确定燃煤电厂土壤PAHs的来源。研究结果表明:该电厂土壤中16种PAHs均有检出,其含量范围为4706~12 175 ug/kg,均值为7436 ug/kg,与国内外其他工业区相比属于中度偏高污染;电厂土壤中PAHs含量随距离的增加总体上表现出先减小后增大的趋势,在600 m处采样点PAHs含量出现大幅上升,且不同环数的PAHs与习,PAHs变化趋势具有较好的一致性;不同层土壤的习,PAHs含量变化特征有一定的差异,但基本表现为先减小后增大再减小的趋势,200 m处采样点的习1oPAHs含量最高。电厂土壤中PAHs主要来自于石油源和煤的燃烧,其中煤燃烧源的贡献率为67.93% ,交通源贡献率为21.74%。Abstract: In this study, 16 kinds of priority PAHs listed by US Environmental Protection Agency
(USEPA) were selected as research objects.Ten soil samples collected from a coal fired power plant in southwest of China were analyzed by gas chromatography-mass spectrometry (CC-MS) to determine the contents of PAHs.Based on the analysis of the characteristics of PAHs and its variation , the source of soil PAHs in coal fired power plant was determined by the method of pollutant source analysis. 'The results showed that 16 PAHs were detected in the soil of the plant , and the contents of 16 PAHs were 4706~12 175 ug/kg.Average content of PAHs were 7 436 ug/kg.Compared with other regions in China and abroad , the PAHs in the soil of the power plant are seriously polluted.The content of PAHs
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