Concentration and distribution of polycyclic aromatic hydrocarbons in surface sediments collected in the Southern Yellow Sea

Abstract

采用气相色谱与质谱联用(gC/MS)技术,在一个航次内对南黄海表层沉积物中16种优先监控的PAHS的污染状况进行了调查,采用菲/蒽、荧蒽/芘、荧蒽/(荧蒽+芘)、吲哚芘/(吲哚芘+苯并(g,H,I)苝)等特定比值对PAHS来源进行了分析.结果表明,南黄海表层沉积物中检出PAHS的总含量为90.4~732.65ng·g-1,各站点均以4~6环为主;与其它站位相比,倾废区的H01站位受到PAHS污染较为明显,无论是16种PAHS总量还是高分子量组分最高值都出现在该站点,虽然该海区沉积物中PAHS的含量没有超出生物影响低值,但苯并(b)荧蒽、吲哚芘和苯并(g,H,I)芘等一些没有最低安全标准的PAHS也有不同程度的检出,对海洋生物具有潜在的毒副作用.PAHS可能来源于原油、生物和煤燃烧造成的污染.The concentrations of sixteen representative Polycyclic Aromatic Hydrocarbons(PAHs) in surface sediment samples collected from the Southern Yellow Sea were determined by GC-MS.The distribution and potential sources of PAH contamination in the region were investigated.The types of PAHs found in the surface sediments were mainly 4～6 ring PAHs,and they are unevenly distributed among the different sampling sites covering an area of 139 km2.The area is known for continuous waste dumping activities in recent years,and indeed sites adjacent to such activities were found to have high levels of PAHs.Some high molecular weight PAH compounds such as benzo$$b$$fluoranthene,dibenzo$$a,h$$anthracene and benzo$$g,h,i$$perylene were detected in some samples.The health implication of these contaminants needs careful assessment since toxicity guidelines are not available for these species.The potential sources of PAHs are discussed using various source-specific PAH indexes such as Phenathrene/Anthracene、Fluoranthene/Pyrene、Fluoranthene/(Fluoranthene+Pyrene) and Indeno [1,2,3-cd] pyrene/(Indeno[1,2,3-cd] pyrene+Benzo [g,h,i] perylene).The composition of the observed PAHs reflects that they originate from both petroleum utilization and incomplete combustion.海洋公益性行业科研专项(No.200705011);中国海监技术支撑体系项目;2008年海洋环境保护及节能减排专项---