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湖泊科学  2011 

河北西大洋水库沉积物中多环芳烃的分布、来源及生态风险评价

DOI: 10.18307/2011.0506

Keywords: 西大洋水库,沉积物,多环芳烃,分布,生态风险

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Abstract:

分析了河北西大洋水库沉积物中16种多环芳烃的含量及分布状况,并对其来源和生态风险进行了分析和评估.结果表明,表层沉积物多环芳烃总含量范围在422.36-1052.90ng/g之间,且由库区上游到坝前逐渐升高.水库剖面沉积物中多环芳烃总含量在388.81-1205.56ng/g之间,自底层20cm到表层多环芳烃呈上升的趋势.沉积物中多环芳烃组成以低环的萘和菲,高环的荧蒽、苯并[b]荧蒽、屈和芘为主.表层和剖面沉积物中多环芳烃总含量与有机碳含量呈正相关关系,相关系数分别为0.91和0.93;此外,有机碳对高环多环芳烃的影响更显著.西大洋水库沉积物中多环芳烃主要来源化石燃料及生物质的燃烧.总体来说,西大洋水库沉积物多环芳烃污染处于中等偏低污染水平,多环芳烃对生态环境的影响目前还处于较低风险水平。

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