滇池湖滨农业土壤中PAHs分布特征及来源

Distribution and Source Diagnosis of Polycyclic Aromatic Hydrocarbons in Agricultural Soil at the Shore of the Dianchi Lake

研究分析了滇池湖滨3种土地土壤中多环芳烃（PAHs）的含量及剖面分布,结果表明：大棚、露地和撂荒地土壤中PAHs含量范围分别为499.72~1 075.76 ng/g,759.40~1 461.06 ng/g和677.38~1 267.00 ng/g,表明当地土壤存在一定的PAHs污染,大棚集约化的种植方式对土壤中PAHs的积累无显著影响。土壤剖面中PAHs含量随深度增加而减少,但最表层土壤由于光解等因素影响PAHs含量较低。PAHs在土壤剖面的分布受到土壤中TOC含量、土壤粒度、人为扰动等因素的影响。通过比值法对表层土壤中PAHs来源进行分析,该地区土壤中PAHs主要来自于燃烧源。

This study analyzed the contents and vertical distribution of PAHs in the three soil profiles at the shore of the Dianchi lake.. The results showed that the content of PAHs in greenhouse,open-ground and abandoned-land were ranged in499.72 ~1075.76ng/g,759.40 ~1461.06ng/g and 677.38 ~1267.00ng/g, respectively. The content of PAHs decreased with increasing depth. Distribution of PAHs in the soil profiles was influenced by TOC,particle size,human disturbance and other factors. Diagnostic ratio was used to determine the origin of PAHs,showing that the PAHs in soils were mainly derived from the combustion of fuels.