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首页> 外文期刊>Environmental Science & Technology >Biodynamic Modeling of PCB Uptake by Macoma balthica and Corbicula fluminea from Sediment Amended with Activated Carbon
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Biodynamic Modeling of PCB Uptake by Macoma balthica and Corbicula fluminea from Sediment Amended with Activated Carbon

机译：活性炭修饰沉积物中的Macoma balthica和Corbicula fluminea吸收PCB的生物力学模型

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Activated carbon amendment was assessed in the laboratory as a remediation strategy forfreshwater sediment contaminated with polychlorinated biphenyls (PCBs) from the Grasse River (near Massena, NY). Three end points were evaluated: aqueous equilibrium PCB concentration, uptake into semipermeable membrane devices (SPMDs), and 28-day bioaccumulation in the clam Corbicula fluminea. PCB uptake by water, SPMDs, and clams followed similar trends, with reductions increasing as a function of carbon dose. Average percent reductions in clam tissue PCBs were 67, 86, and 95% for activated carbon doses of 0.7,1.3, and 2.5% dry wt, respectively. A biodynamic model that incorporates sediment geochemistry and dietary and aqueous uptake routes was found to agree well with observed uptake by C. fluminea in our laboratory test systems. Results from this study were compared to 28-day bioaccumulation experiments involving PCB-contaminated sediment from Hunters Point Naval Shipyard (San Francisco Bay, CA) and the clam Macoma balthica. Due to differences in feeding strategy, M. balthica deposit-feeds whereas C. fluminea filter-feeds, the relative importance of the aqueous uptake route is predicted to be much higher for C. fluminea than for M. balthica. Whereas M. balthica takes up approximately 90% of its body burden through sediment ingestion, C. fluminea only accumulates approximately 45% via this route. In both cases, results strongly suggest that it is the mass transfer of PCBs from native sediment to added carbon particles, not merely reductions in aqueous PCB concentrations, that effectively reduces PCB bioavailability and uptake by sediment-dwelling organisms.
机译：在实验室中评估了活性炭改良剂的修复策略，以作为被格拉斯河（纽约州马塞纳附近）污染的多氯联苯（PCB）污染的淡水沉积物的补救策略。评价了三个终点：含水平衡的PCB浓度，半渗透膜装置（SPMD）的吸收以及蛤Cor（Corbicula fluminea）28天的生物蓄积。水，SPMD和蛤lam对PCB的吸收也遵循类似的趋势，并且随着碳剂量的增加而减少。对于干重为0.7、1.3和2.5％的活性炭，蛤tissue组织PCB的平均减少百分比分别为67％，86％和95％。一个结合了沉积物地球化学以及饮食和水吸收途径的生物动力学模型，被发现与我们实验室测试系统中观察到的C. fluminea吸收非常吻合。这项研究的结果与28天的生物富集实验进行了比较，该实验涉及来自Hunters Point海军造船厂（加利福尼亚州旧金山湾）和蛤Mac Macoma balthica的多氯联苯污染的沉积物。由于饲喂策略的不同（巴氏支原体的沉积物喂食，而南美白对虾滤料的进食），据预测，对水生摄取途径的相对重要性，比拟百里香要高得多。尽管巴氏支原体通过摄入沉积物吸收了大约90％的身体负担，但通过这种途径，流感梭菌仅累积了大约45％。在这两种情况下，结果都强烈表明，多氯联苯从天然沉积物到添加的碳颗粒的质量转移，不仅仅是降低含水多氯联苯的浓度，有效地降低了多氯联苯的生物利用度和沉积物生物的吸收。

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