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首页> 外文期刊>Environmental Science & Technology >Modeling Pcb Mass Transfer And Bioaccumulation In A Freshwater Oligochaete Before And After Amendment Of Sediment With Activated Carbon
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Modeling Pcb Mass Transfer And Bioaccumulation In A Freshwater Oligochaete Before And After Amendment Of Sediment With Activated Carbon

机译：用活性炭修正沉积物前后淡水低聚藻中的Pbb传质和生物富集模型

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摘要

A mass transfer model is presented that couples sediment geochemistry with PCB bioaccumulation by the benthic invertebrate, Lumbriculus variegatus. This model accounts for PCB intraparticle mass transfer, desorption, and adsorption by different particle types, and uptake by the benthic invertebrates through two pathways, dermal absorption, and sediment ingestion. The biological parameters, dermal uptake coefficients, depuration rates, sediment ingestion rates, and uptake efficiencies, were measured independently. The model was evaluated by laboratory bioaccumulation experiments for three freshwater sediments that were characterized for PCB concentration, PCB desorption rate, and equilibrium partitioning behavior. The model was also tested for its ability to predict changes in PCB bioaccumulation in the three sediments after amendmentwith activated carbon to reduce PCB bioavailability. For most PCB congeners, the modeled results and measured values agree within a factor of 2 for all three sediments before and after treatment with activated carbon. This model broadly agrees with the experimental data and can be used to predict changes in bioaccumulation of hydrophobic organic compounds by the benthic organisms in sediments with known geochemical characteristics and under different sorbent amendment scenarios.
机译：提出了一种传质模型，该模型将底栖无脊椎动物Lumbriculus variegatus的沉积物地球化学与PCB的生物富集耦合在一起。该模型说明了PCB内部颗粒的质量转移，解吸和不同颗粒类型的吸附以及底栖无脊椎动物通过两种途径（真皮吸收和沉积物摄入）的摄取。分别测量生物学参数，皮肤吸收系数，净化率，沉积物摄入率和吸收效率。该模型通过实验室生物富集实验对三种淡水沉积物进行了评估，这些沉积物的特征在于PCB浓度，PCB解吸速率和平衡分配行为。还对该模型进行了预测，以预测其在用活性炭修正后降低三种生物的生物利用度后三种沉积物中PCB生物蓄积变化的能力。对于大多数多氯联苯同类物而言，在用活性炭处理之前和之后，所有三种沉积物的模拟结果和测量值均在2的系数之内。该模型与实验数据基本吻合，可用于预测底栖生物在已知地球化学特征和不同吸附剂改性方案下底栖生物对疏水性有机化合物的生物富集变化。

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