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Polycyclic aromatic hydrocarbons (PAHs) in surface sediments of Monastir Bay (Tunisia, Central Mediterranean): distribution, origin and seasonal variations

机译:莫纳斯提尔湾(突尼斯,中地中海)表面沉积物中的多环芳烃(PAHs):分布,成因和季节变化

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摘要

To assess PAH contamination state of Monastir Bay, surface sediments were collected and analysed for 17 selected parent PAHs by GC/MS. Sediments were sampled from five sites in wet and dry seasons. Total PAH concentrations were in the range of 25.6 to 576.8 ng/g d.wt in winter and 44.9-395.8 ng/g d.wt in summer. Comparison of results with Sediment Quality Guidelines suggested no eco-toxicological risk for benthic organisms. The use of molecular indices has shown that PAHs in surface sediments originate mainly from pyrolytic sources. Total PAH concentrations in surface sediments showed no significant correlations with organic matter content and pelite fraction. The analysis of spatial and seasonal variations of PAHs in surface sediments has demonstrated that final distribution of PAHs in surface sediments is mainly governed by hydrological conditions.
机译:为了评估莫纳斯提尔湾的PAH污染状况,收集了表面沉积物,并通过GC / MS分析了17种选定的母体PAH。在干燥和潮湿的季节,从五个地点采样了沉积物。冬季总PAH浓度在25.6至576.8 ng / g d.wt范围内,而夏季则在44.9-395.8 ng / g d.wt之间。将结果与《沉积物质量指南》进行比较表明,底栖生物没有生态毒理学风险。分子指数的使用表明,表层沉积物中的PAHs主要来自热解源。表层沉积物中的总PAH浓度与有机质含量和pelite分数无显着相关性。对表层沉积物中多环芳烃的时空变化分析表明,表层沉积物中多环芳烃的最终分布主要受水文条件控制。

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