Pollution characteristics and source analysis of polycyclic aromatic hydrocarbons in soil of coal fired power plant

Résumé fourni par la source

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 (GC-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 4 706~12 175 μg/kg.Average content of PAHs were 7 436 μg/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 in soil showed the trend of decreasing firstly and then increasing with the increase of distance in general.The content of PAHs increased sharply at the sampling point of 600 m,and the variation of PAHs with different ring number and ∑16PAHs was in good agreement.The variations of contents of ∑16PAHs in different layers of soils were different,but the tendency reduced at first,then increase and then decrease.The content of ∑16PAHs reached the highest at 200 m of sampling sites.The analytical solutions of the ratio method show that the PAHs in the soil of the power plant mainly came from oil source and coal combustion.The results of principal component analysis show that the contribution of PAHs coal combustion source in the soil of power plant is 67.93%,and the contribution of traffic source is 21.74%.

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