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首页> 外文期刊>Environmental Science & Technology >Comparison of the in Situ and Desorptipn Sediment-Water Partitioning of Polycyclic Aromatic Hydrocarbons and Polychlorinated Biphenyls
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Comparison of the in Situ and Desorptipn Sediment-Water Partitioning of Polycyclic Aromatic Hydrocarbons and Polychlorinated Biphenyls

机译：多环芳烃和多氯联苯的原位和去水质沉积物-水分配比较

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摘要

In situ sediment-porewater partitioning of polycyclic aromatic hydrocarbons (PAHs) measured in three cores from Boston Harbor, MA, has led us to suggest that only a fraction of the total measured sediment PAH concentration is available for equilibrium partitioning (AEP fraction). To test this, aqueous PAH concentrations were measured in laboratory de-sorption experiments using subsamples of the same Boston Harbor sediments. The observed concentrations were consistent with what we predicted from the field-derived AEP values: C_(aqueous) = (C_(sediment) x AEP)/(f_(oc) x K_(oc)) where f_(oc) is the fraction organic carbon in the sediment and K_(oc) is the organic carbon normalized sediment-water partition coefficient. Equilibrium partitioning models based on the total measured sediment PAH concentrations overestimated the measured aqueous PAH concentrations by as much as 100 times in some cases. Only a small fraction of the sediment phenanthrene and pyrene concentrations (1-40%) appeared to be available for equilibrium partitioning. Both in situ and laboratory desorption aqueous polychlorinated biphenyl (PCB) concentrations were consistent with equilibrium partitioning models and the assumption that 100% of these compounds was available for equilibrium partitioning. These results are particularly important to efforts to predict the environmental mobility and bio-availability of the PAHs.
机译：在马萨诸塞州波士顿港的三个岩心中对多环芳烃（PAHs）进行原位沉积物-孔隙水分配，这使我们提出，只有总测量的沉积物PAH浓度的一部分可用于平衡分配（AEP分数）。为了测试这一点，在实验室解吸实验中使用相同波士顿港沉积物的子样品测量了PAH水溶液的浓度。观察到的浓度与我们根据现场得出的AEP值预测的浓度一致：C_（水溶液）=（C_（沉积物）x AEP）/（f_（oc）x K_（oc）），其中f_（oc）是分数沉积物中的有机碳，K_（oc）是归一化沉积物-水分配系数的有机碳。在某些情况下，基于总的测得沉积物PAH浓度的平衡分配模型高估了测得的水性PAH浓度多达100倍。似乎只有一小部分沉积物菲和pyr浓度（1-40％）可用于平衡分配。原位和实验室解吸的多氯联苯水溶液（PCB）的浓度均与平衡分配模型一致，并且假定这些化合物的100％可用于平衡分配。这些结果对于预测多环芳烃的环境迁移率和生物利用度特别重要。

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