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首页> 外文OA文献 >Assessment of surface and ground waters, stream and estuary sediments and other ecosystem receptors to determine long term impacts of surface PCB and heavy metal releases, Makinsons, Newfoundland
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Assessment of surface and ground waters, stream and estuary sediments and other ecosystem receptors to determine long term impacts of surface PCB and heavy metal releases, Makinsons, Newfoundland

机译：评估地表水和地下水，溪流和河口沉积物以及其他生态系统受体，以确定表面pCB和重金属释放的长期影响，makinsons，Newfoundland

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摘要

As part of a National Contaminated Sites Remediation Program (NCSRP), FFC/BEAK (1992d) identified polychlorinated biphenyl (PCB) and heavy metal contamination from an old salvage yard at the top of a small drainage basin located in Makinsons, Newfoundland. Given the lack of understanding of how PCBs and heavy metals are distributed and attenuated in small drainage basins that consist of thin overburden underlain by fractured bedrock, a study was undertaken with the main objective of determining how PCBs and heavy metals are distributed in the surface waters, ground waters, soils, sediments within the stream and estuary, and bivalve bioreceptors (Mercenaria mercenaria). It was necessary to describe the spatial distribution of PCBs and heavy metals in order to determine the role that these waters, sediments, and bioreceptors, play in contaminant transport within this small drainage basin. -- There is evidence that the salvage yard is contributing PCBs, Cr, As, MnO, Fe₂O₃, and Pb to the Makinsons drainage basin. The major pathway is believed to be surface runoff carrying contaminants adsorbed on sedimentary and particulate matter from the salvage yard to the stream. However, PCBs were unexpectedly detected in stream sediments and soils located upgradient from the salvage yard, suggesting an additional source of PCB contamination. This additional source probably relates to the oiling of roads to control dust before they were paved. -- Based on the surface water and ground water chemistry described in this study, mobilization of dissolved metals from the salvage yard-bog area was found to be negligible. Relatively neutral pH (> 6) conditions detected in drainage basin ground waters most likely limited the aqueous solubility of metals and resulted in the predominant species being adsorbed to the soil framework. An additional source of contamination to the drainage basin is suspected to include domestic septic effluent. M. mercenaria collected from the South River estuary were enriched in Fe, Ni, Mn, Cd, Cr, and Pb, relative to average concentrations of M. mercenaria collected along the Atlantic coast of the US. However, PCBs were not present ≥ 0.05 ppm (wet weight) in M. mercenaria from the estuary. Therefore, PCBs adsorbed on suspended material are either being deposited closer to the salvage yard or are being diluted by uncontaminated suspended matter. Regardless, PCBs are not available to these relatively immobile bioreceptors in the estuary.
机译：作为国家污染场地修复计划（NCSRP）的一部分，FFC / BEAK（1992d）在位于纽芬兰的Makinsons的一个小型流域的顶部，从一个旧的打捞场中发现了多氯联苯（PCB）和重金属污染。由于缺乏对多氯联苯和重金属如何在由破裂基岩覆盖的薄覆盖层组成的小型流域中如何分布和衰减的认识，因此进行了一项旨在确定多氯联苯和重金属如何在地表水中分布的研究。 ，地下水，土壤，河流和河口内的沉积物以及双壳类生物受体（Mercenaria mercenaria）。有必要描述多氯联苯和重金属的空间分布，以便确定这些水，沉积物和生物受体在这个小流域内污染物迁移中的作用。 -有证据表明，打捞场正在向Makinsons流域提供PCBs，Cr，As，MnO，Fe 2 O 3和Pb。人们认为，主要途径是地表径流，这些污染物携带着从打捞场到河流的吸附在沉积物和颗粒物上的污染物。但是，在从打捞场开始逐渐上升的河流沉积物和土壤中意外发现了多氯联苯，这表明了多氯联苯污染的另一个来源。此额外来源可能与在铺路之前为道路上的灰尘涂油以控制灰尘。 -根据本研究中描述的地表水和地下水化学性质，发现从打捞场沼泽地带动溶解的金属是微不足道的。在流域地下水中检测到的相对中性pH（> 6）条件很可能会限制金属的水溶性，并导致主要物种被吸附到土壤骨架中。怀疑流域的另一污染源包括家庭化粪池污水。相对于沿美国大西洋沿岸收集的平均浓度的沙门氏菌，从南河河口收集的沙门氏菌富含Fe，Ni，Mn，Cd，Cr和Pb。但是，从河口出发的美人球菌中PCBs的含量不超过0.05 ppm（湿重）。因此，吸附在悬浮材料上的多氯联苯要么沉积得更接近打捞场，要么被未污染的悬浮物稀释。无论如何，这些河口相对较固定的生物受体均无法使用PCB。

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    Bourgeois Jason;

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