清澜港-八门湾表层沉积物PAHs分布、来源及风险评价

Distribution, Source and Risk Assessment of Polycyclic Aromatic Hydrocarbons in Surface Sediments form Qinglan Port and Bamen Bay

该文在海南文昌清澜港及八门湾设置18个采样站位,采集表层沉积物样品,以GC-MS分析了样品中优先控制的16种PAHs。研究结果表明:16种PAHs在表层沉积物样品中均有检出,PAHs总浓度在179.51~1233.93 ng/g之间,平均浓度为322.48 ng/g。运用特征化合物比值和FA/MLR共同确定PAHs的主要来源分别为化石燃料和木材等的燃烧、石油产品的挥发和泄露、汽油机动车排放,3种来源对总PAHs的贡献率分别为69.5%、19.6%、10.9%。ERL评价单组分PAHs潜在生态风险极少产生负面生态效应;MERM-Q分析表明,PAHs综合生态风险可能性比较小。

18 surface sediment samples were collected in Qinglan Port and Bamen Bay,Wenchang,Hainan.16 US EPA priority PAHs were analyzed by GC-MS.The results showed that 16 PAHs were detected in surface sediment samples.The total concentration of PAHs ranged from 179.51 to 1233.93 ng/g,with a mean value of 322.48 ng/g.Using characteristic ratio method and principal component analysis and multiple linear regression(FA/MLR),the main sources and contribution rates of PAHs were analyzed.The main sources in surface sediments was combustion of fossil fuels and wood,volatilization and leakage of petroleum,and gasoline vehicle emissions.The contribution rates of three sources to total PAHs were 69.5%,19.6% and 10.9% respectively.The potential ecological risk of single PAHs was assessed using ERL and the results indicated negative ecological effects was rare.The possibility of comprehensive ecological risk of PAHs evaluating by MERM-Q was smaller.