辽河口湿地土壤多环芳烃的分布及来源研究

于2008年10月、2009年5月和8月采集辽河口湿地31个表层土壤样品，利用GC-FID技术定量分析其16种优控多环芳烃（PAH）含量.结果表明，PAHs总量分布范围为293.4～1936.9 ng·g^-1，平均值为851.5 ng·g^-1，其中油井区苇田PAHs含量最高（1717.5 ng·g^-1），滩涂区最低（614.6 ng·g^-1）.2008年10月PAHs总量和中高环组分比重均高于2009年5月和8月.应用不同环数的相对丰度和比值法进行来源解析，结果表明，燃烧是2008年10月的主要来源，石油污染和燃烧源的混合来源为2009年5月和8月的主要来源.主成分分析和多元线性回归法显示交通污染和燃煤混合来源为2008年10月PAHs的主要来源，贡献率为45.5%；石油和交通混合污染是2009年5月和8月PAHs的主要来源，贡献率分别为75.2%和42.2%.

Distribution and Sources of PAHs in Soil from Liaohe Estuarine Wetland

16 polycyclic aromatic hydrocarbons (PAHs) were measured by GC-FID for 31surface soil samples collected from Liaohe estuary wetland in October of 2008 and May and August of 2009. The results showed that the total concentrations of PAHs in surface soil ranged from 293.4 ng·g^-1 to 1936.9 ng·g^-1 with a mean of 851.5 ng·g^-1. The contents of PAHs were the highest in the oilwell reed field and the lowest in the beach. The total concentrations of PAHs and proportion of median and high molecular weight of samples collected in October was higher than those collected in May and August. The relative abundance of different benzene rings and the ratio analysis illustrated that pyrolysis was the main source in October, and the mixed pollution of pyrogenic and oil spill was the dominant source in May and August. The principle component analysis-multiple linear regression analysis (PCA-MLR) indicated that the major source in October was coal/vehicular emission (accounted for 45.5%), and the mixture of vehicular exhaust and oil spill was the major source in May and August (accounted for 75.2% and 42.2% respectively).