环渤海西部地区表层土壤中的多环芳烃

PAHs in surface soils from the western watershed of Bohai Sea

利用加速溶剂提取和GC-MS分析技术,测定了采自环渤海西部地区302个表层土壤样品中16种多环芳烃的含量.结果表明,区域表土中16种多环芳烃的浓度范围为(546±854)ng.g-1.16种多环芳烃表现出典型的土壤谱分布形式,即三、四环化合物含量较高.高浓度样点多分布在京、津、唐地区,河北省西部包括邯郸西部、邢台西部、石家庄西部、张家口南部,以及山东省的济南和淄博;而浓度低值点一般位于河北省北部包括张家口和承德北部地区以及山东西北部的冲积平原地带.这些分布特征与区域排放源分布相关.低分子量多环芳烃在土壤中的浓度变异幅度小于高分子量组份.

302 surface soil samples were collected from the western watershed of Bohai Sea and measured for 16 polycyclic aromatic hydrocarbons （PAHs）. The arithmetic mean and standard deviation of the total PAHs were （546 ± 854 ） ng· g^ - 1. The spectrum of the PAH species was similar to those observed in soils from other places with domination of 3-and 4-ring compounds, The relatively higher concentrations were observed in the Beijing-Tianjin- Tangshan metropolitan area, southwest of Hebei along Xingtai-Handan-Shijianzhuang-Zhangjiakou and two isolated cities in Shandong （Zibo and Jinan）. The sampling sites with relatively lower PAHs concentrations were from north mountainous area of Hebei and alluvial plain of northwestern Shandong. The spatial distribution pattern of PAHs in surface soil was associated with distribution of emission sources of PAHs. The concentration variability of the lower molecular weight compounds in surface soil is generally lower than that of the higher molecular weight ones.