环渤海北部沿海地区表层土壤中PAHs的污染特征及风险评价

系统采集了环渤海北部沿海地区31个表层土壤样品,利用GC/MS分析了16种USEPA优控多环芳烃(PAHs)的含量和组分特征,运用主成分因子载荷法揭示了其污染来源,并初步评价了其风险水平.结果表明,沿海地区65%的土壤已被污染,最高污染样点PAHs含量达920.4ng·g-1,平均含量309.5ng·g-1,与国内外相关研究比较,处于中低等污染水平.各类燃料的不完全燃烧是该地区土壤中PAHs的主要来源,石油类挥发或泄漏对采油区土壤中PAHs的累积影响显著.

Characteristics and Risk Assessment of Polycyclic Aromatic Hydrocarbons in Surface Soil along the North Costal Area of the Bohai Sea

Concentrations,distribution,sources and risk level of 16 polycyclic aromatic hydrocarbons(PAHs)listed for prior control by US EPA were studied along the north costal area of the Bohai Sea.PAH contents in 31 surface soil samples from this area were detected by gas chromatography equipped with mass spectrometry(GC/MS).Principal component analysis was made to identify sources of PAH pollutants.Results showed that,1)PAH concentrations in this area ranged from 66.3ng·g-1 to 920.4ng·g-1,which suggested that there were low to mid levels of PAH contamination;2)According to PCA analysis,incomplete combustion and burning of fuels were the major sources for the contamination,while petroleum volatilization and leakage had influences on the PAH accumulation in petroleum industrial area .3)Pollution risk analysis showed that 65% of the Tianjin Binhai Industrial Area was contaminated by PAHs.