Purpose

The aims of the study were to investigate the interaction between fractions of organic matter and polycyclic aromatic hydrocarbons (PAHs) in bottom sediments and to use mussels as passive biomonitors and consensus-based sediment quality guidelines for ecological risk assessment in sediments.

Methods

Bottom sediment samples were taken from 46 points located in the Rożnów reservoir (Poland). The sediment organic matter (SOM) characteristics included total carbon (TC), total organic carbon (TOC), humic acid carbon (Cha), fulvic acid carbon (Cfa), non-hydrolysing carbon (Cnh), and dissolved organic carbon (DOC). The extraction procedure was carried out in bottom sediments as well as in freeze-dried mussel tissue samples to directly determine the accumulation potential of PAHs to the living organisms in their natural environment.

Results

The content of organic matter fractions was in the following order: Cfa (fulvic acid) > Cnh (non-hydrolysing carbon) > Cha (humic acid) > DOC (dissolved organic carbon). The mean ∑16PAHs (μg kg⁻¹) concentration was 1755.2 ± 724 (total) and 256 ± 254 (bioavailable) in sediments and 1740 ± 72.2 in the mussel tissues. A significant positive correlation was found between the concentration of PAHs in the mussel tissues and the total and bioavailable concentration of PAHs in bottom sediments.

Conclusion

The PAH concentration in bottom sediments depended on the stabile carbon forms Cnh. Principal component analysis (PCA) suggests that the fine fraction can significantly increase the bioavailability of PAHs and can be an important factor in the distribution of PAHs in the sediments.

中文翻译：

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大坝水库底部沉积物中多环芳烃的分布，与有机质的相互作用以及对底栖动物的危害

目的

该研究的目的是调查底质沉积物中有机质组分与多环芳烃（PAHs）之间的相互作用，并使用贻贝作为被动生物监测器和基于共识的沉积物质量准则进行沉积物生态风险评估。

方法

底部沉积物样本是从位于波兰Rożnów水库的46个点采集的。沉积物有机质（SOM）的特征包括总碳（TC），总有机碳（TOC），腐殖酸碳（Cha），黄腐酸碳（Cfa），非水解碳（Cnh）和溶解性有机碳（DOC） ）。提取程序在底部沉积物以及冷冻干燥的贻贝组织样品中进行，以直接确定PAHs在其自然环境中对生物的积累潜力。

结果

有机物部分的含量按以下顺序排列：Cfa（富里酸）> Cnh（非水解碳）> Cha（腐殖酸）> DOC（溶解的有机碳）。沉积物中的平均∑16PAHs（微克kg ^-1）浓度为1755.2±724（生物利用度），贻贝组织中的平均∑16PAHs浓度为（生物可利用）256±254（生物利用度）。贻贝组织中的PAHs浓度与底部沉积物中PAHs的总浓度和生物利用度之间存在显着的正相关关系。

结论

底部沉积物中的PAH浓度取决于稳定的碳形式Cnh。主成分分析（PCA）表明，细颗粒可显着增加PAHs的生物利用度，并且可能是沉积物中PAHs分布的重要因素。