海口市主城区农田表层土壤PAHs分布特征及来源解析研究

Distribution Characteristics and Source Analysis ofPAHs in Farmland Topsoil in Main Urban Area of Haikou

土壤质量与人类健康关系密切,通过采集海口市主城区农田表层土壤样品,液相色谱分析样品中优先控制的16种PAHs,对土壤中PAHs的组成分布特征进行了分析,并通过定性和定量两种方法解析了PAHs的污染来源。结果表明,海口市主城区农田表层土壤中PAHs含量范围为6.6~111.0 ng/g,平均含量58.3 ng/g;ΣPAHs与土壤理化性质无明显相关性;环数基本呈现出低环>中环>高环的一致分布规律。比值法和FA/MLR源解析结果表明,PAHs的3种主要来源分别为石油产品的挥发和泄露、汽车尾气排放、化石及生物质燃烧,其贡献率分别为51.8%、29.3%、18.9%。

Soil quality is closely related to human health.By collecting farmland topsoil samples in the main urban area of Haikou,16 US-EPA priority PAHs were analyzed by liquid chromatography.The composition and distribution characteristics of PAHs were analyzed and the pollution sources of PAHs were qualitatively and quantitatively analyzed.The results showed that the content of PAHs in farmland topsoil in the main urban area of Haikou ranged from 6.6 to 111.0 ng/g,with an average content of 58.3 ng/g.There was no significant correlation between∑PAHs and soil physical and chemical properties.The number of rings basically showed the uniform distribution law of low ring>middle ring>high ring.The results of ratio method and FA/MLR source analysis showed that,the three main sources of PAHs were volatilization and leakage of petroleum products,gasoline vehicle emissions,fossil and biomass combustion,with their contribution rates of 51.8%,29.3%and 18.9%respectively.