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本文对大连近海海域15个表层沉积物样品中16种多环芳烃(PAHs)污染特征及来源进行研究。结果表明,沉积物中∑16PAHs总浓度为30.04×10~(-9)~89.24×10~(-9),平均值为50.84×10~(-9),其中工业区显著高于城市地区(p<0.05),极显著高于农村地区(p<0.01)。沉积物中PAHs含量与总有机碳(TOC)含量间存在显著正相关性(p<0.05),表明沉积物有机质含量是影响PAHs含量的主要因素。主成分分析得出,大连近海海域PAHs污染源为石油泄漏造成的石油源、生物质及化石燃料燃烧形成的燃烧源和燃油燃烧形成的交通源。
In this paper, the characteristics and sources of 16 polycyclic aromatic hydrocarbons (PAHs) contaminants in 15 surface sediment samples in offshore areas of Dalian were studied. The results showed that the total concentrations of Σ16PAHs in sediments ranged from 30.04 × 10 -9 to 89.24 × 10 -9, with an average of 50.84 × 10 -9. The industrial areas were significantly higher than the urban areas p <0.05), significantly higher than in rural areas (p <0.01). There was a significant positive correlation between the content of PAHs and total organic carbon (TOC) in sediments (p <0.05), indicating that the organic matter content of sediment is the main factor affecting the content of PAHs. The principal component analysis shows that PAHs pollution source in the coastal waters of Dalian is the source of transportation of petroleum, biomass and fossil fuel, and the traffic source of fuel combustion caused by petroleum leakage.