Bioavailability of hydrophobic organic contaminants and quality of organic carbon
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Abstract
U.S. laws require that contaminant bioaccumulation potential be evaluated before dredged material can be recycled. Simple fugacity models, e.g. organic contaminant aqueous partition coefficient (Koc)-derived theoretical bioaccumulation potential, are commonly used to estimate the partitioning of hydrophobic organic contaminants between sediment organic matter and organism lipid. Koc-derived models, with or without the addition of a soot carbon term, did not accurately or consistently predict total polycyclic aromatic hydrocarbons (PAHs) and polychlorobiphenyls partitioning of eight sediments from ongoing dredging operations onto C18-coated filter paper. These models also failed to predict the partitioning of individual PAHs from these eight sediments. These data underscore the trade-offs between the ease of using simple models and the uncertainty of predicted partitioning values.
Keywords
Hydrophobic organic contaminants Fugacity Organic contaminant aqueous partition coefficient Total organic carbon Sediments Black carbonNotes
Acknowledgements
This work was funded by the Dredged Materials Program administered by the U.S. Army Engineer Research and Development Center, at Waterways Experiment Station in Vicksburg, Mississippi.
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