The source, distribution, and potential toxicity of sedimentary polycyclic aromatic hydrocarbons (PAHs) along the mouth bar of the Yangtze River Estuary were investigated. Total concentrations of 17 PAHs in the study area ranged from 34.94 to 580.26 ng/g (mean value 146.31 ng/g). Results of PMF model revealed that mixed vehicle emissions (38.43%), natural gas combustion (24.98%), biomass combustion (20.76%) and coal combustion (15.83%) were sources of these sedimentary PAHs. The ERL/ERM, TEL/PEL and TEC/PEC values showed that the potential toxicity of PAHs was at low to medium level, but the presence of benzo[a]pyrene (BaP) and benzo[e]pyrene (BeP) requires more attention and research. Sedimentary PAHs pollution level in the three shoals (East Nanhui Shoal, Jiuduansha Shoal and Hengsha Shoal) was higher than that of the two passages (South Passage and North Passage), which demonstrates the possibility of restoration of the adjacent shoals by dredged soils in terms of PAHs pollution.

研究了长江口口沿河道沉积多环芳烃（PAHs）的来源，分布和潜在毒性。研究区域中17种PAHs的总浓度范围为34.94至580.26 ng / g（平均值146.31 ng / g）。PMF模型的结果表明，这些沉积型PAHs的来源是混合汽车排放（38.43％），天然气燃烧（24.98％），生物质燃烧（20.76％）和煤炭燃烧（15.83％）。ERL / ERM，TEL / PEL和TEC / PEC值表明，PAHs的潜在毒性处于中低水平，但是存在苯并[ a ] py（BaP）和苯并[ e]py（BeP）需要更多的关注和研究。三个浅滩（东南汇浅滩，九段沙浅滩和横沙浅滩）的沉积PAHs污染水平高于两个通道（南通道和北通道）的水平，这表明用疏ed土壤恢复相邻浅滩的可能性多环芳烃的污染。