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首页> 外文期刊>Environmental Science & Technology >Uptake of sediment-bound bioavailable polychlorobiphenyls by benthivorous carp (Cyprinus carpio)
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Uptake of sediment-bound bioavailable polychlorobiphenyls by benthivorous carp (Cyprinus carpio)

机译：杂食鲤鱼（Cyprinus carpio）对沉积物结合的生物可利用的多氯联苯的吸收

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摘要

It is unclear whether accumulation of sediment-bound chemicals in benthivorous fish depends on the degree of sequestration in the sediment like it does for invertebrates. Here, we report on the potential of slow and fast desorbing sediment-bound polychlorobiphenyl (PCB) fractions for accumulation in carp (Cyprinus carpio) in lake enclosures treated with different nutrient doses. Routes of PCB uptake were quantitatively evaluated for 15 PCBs (log K-0W range 5.6-7.8) using model analysis. Fast-desorbing PCB fractions in the sediment were defined as the ratio of 6-h Tenax-extractable to (total) Soxhlet-extractable concentrations. These fractions varied between 4 and 22% and did not show a clear trend with log K-0W. However, bioaccumulation of PCBs in carp correlated much better with Tenax-extractable concentrations than with total-extractable concentrations. Nutrient additions in the enclosures had a positive effect on PCB accumulation. Model results show that PCB uptake in carp can be explained from (1) uptake through invertebrate food, (2) uptake from fast-desorbing fractions in ingested sediments, and (3) uptake from water, where PCBs are in partitioning equilibrium with fast-desorbing fractions. The main implication of this research is that fast-desorbing PCB fractions in sediments have great predictive potential for bioaccumulation in benthivorous fish.
机译：尚不清楚底栖鱼类中与沉积物结合的化学物质的积累是否像无脊椎动物一样取决于沉积物中的螯合程度。在这里，我们报告了缓慢和快速解吸沉积物结合的多氯联苯（PCB）组分在鲤鱼（Cyprinus carpio）中在不同养分剂量处理下的池塘中积累的潜力。使用模型分析，定量评估了15种PCB（log K-0W范围5.6-7.8）的PCB吸收途径。沉积物中快速解吸的PCB组分定义为6小时可提取的Tenax与（总）索氏提取的浓度之比。这些分数在4％到22％之间变化，对数K-0W没有显示出明显的趋势。然而，鲤鱼​​中PCBs的生物积累与Tenax可提取浓度的相关性比总可提取浓度的好得多。外壳中添加的营养物对PCB的积聚有积极影响。模型结果表明，鲤鱼中PCB的吸收可以解释为（1）通过无脊椎动物食物的摄取，（2）摄入的沉积物中快速解吸组分的摄取以及（3）水中的摄取，其中PCB处于快速分配状态。解吸级分。这项研究的主要意义在于沉积物中快速解吸的PCB组分对底栖鱼类的生物蓄积具有巨大的预测潜力。

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