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首页> 外文期刊>Environmental Science & Technology >Addition of activated carbon to sediments to reduce PCB bioaccumulation by a polychaete (Neanthes arenaceodentata) and an amphipod (Leptocheirus plumulosus)
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Addition of activated carbon to sediments to reduce PCB bioaccumulation by a polychaete (Neanthes arenaceodentata) and an amphipod (Leptocheirus plumulosus)

机译：向沉积物中添加活性炭，以减少多毛（（Neanthes arenaceodentata）和两栖纲（Leptocheirus plumulosus）的PCB生物积累。

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This work examines the effects of adding coke or activated carbon on the bioavailability of polychlorinated biphenyls (PCBs) in contaminated sediment from South Basin at Hunters Point, San Francisco Bay. We show with 28-day sediment exposure tests that PCB bioaccumulation in a polychaete (Neanthes arenaceodentata) is reduced by 82% following 1-month contact of sediment with activated carbon and by 87% following 6-months contact of sediment with activated carbon. PCB bioaccumulation in an amphipod (Leptocheirus plumulosus) is reduced by 70% following 1-month contact of sediment with activated carbon and by 75% after 6-months contact of sediment with activated carbon. Adding coke had a negligible effect on reducing PCB bioaccumulation, probably because of the low specific surface area and the slow kinetics of PCB diffusion into the solid coke particles. Reductions in congener bioaccumulation with activated carbon were inversely related to congener K-ow, suggesting that the efficacy of activated carbon is controlled by the mass-transfer rate of PCBs from sediment and into activated carbon. We find that reductions in aqueous PCB concentrations in equilibrium with the sediment were similar to reductions in PCB bioaccumulation. While no lethality was observed following activated carbon addition, growth rates were reduced by activated carbon for the polychaete, but not for the amphipod, suggesting the need for further study of the potential impacts of activated carbon on exposed communities. The study suggests that treatment of the biologically active layer of contaminated sediments with activated carbon may be a promising insitu technique for reducing the bioavailability of sediment associated PCBs and other hydrophobic organic compounds.
机译：这项工作研究了添加焦炭或活性炭对旧金山湾亨特角南盆地受污染沉积物中多氯联苯（PCB）生物利用度的影响。我们通过28天的沉积物暴露测试表明，沉积物与活性炭接触1个月后，多壳动物（Neanthes arenaceodentata）中的PCB生物蓄积减少了82％，而沉积物与活性炭接触6个月后则降低了87％。沉积物与活性炭接触1个月后，两栖纲动物（Leptocheirus plumulosus）中的PCB生物蓄积减少了70％，而沉积物与活性炭接触6个月后则降低了75％。添加焦炭对减少PCB生物积累的影响微不足道，这可能是因为低的比表面积和PCB扩散到固体焦炭颗粒中的动力学很慢。用活性炭减少同类生物的积累与同类K-ow成反比，这表明活性炭的功效受PCB从沉积物到活性炭的传质速率控制。我们发现，与沉淀物平衡时，含水多氯联苯浓度的降低类似于多氯联苯生物累积的降低。尽管在添加活性炭后未观察到致死性，但对于多毛cha而言，活性炭降低了增长率，但对于两栖动物却没有，这表明需要进一步研究活性炭对裸露群落的潜在影响。研究表明，用活性炭处理受污染沉积物的生物活性层可能是降低沉积物相关多氯联苯和其他疏水性有机化合物生物利用度的有前途的原位技术。

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