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| - Dissolved PCBs, PAHs, and HCB inPore Waters and Overlying Watersof Contaminated Harbor Sediments
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| Abstract
| - Aqueous concentrations of polychlorinated biphenyls(PCBs), polyaromatic hydrocarbons (PAHs), pentachlorobenzene, and hexachlorobenzene (HCB) were determined byexposing low-density polyethylene (LDPE) strips to the porewaters and the overlying water in two contaminatedharbors. LDPE strips were also exposed in the laboratoryto sediment slurries and to stagnant sediments collectedat the same locations. Surprisingly short equilibration timescales (1−60 days for log Kow< 7) were observed forthe exposures to sediment slurries. This was a result of aprofound decrease in transport resistance, due to thepresence of particles in the aqueous boundary layer.Concentrations in the pore water were calculated fromthe initial uptake rates and the dissipation rates of performancereference compounds. Good correspondence existedwith concentrations estimated from the equilibrium amountsin the strips and LDPE−water partition coefficients.Sediment−water partition coefficients for PAHs werehigher than for PCBs and chlorobenzenes by ∼1 order ofmagnitude. A one-dimensional diffusion model wasused to describe contaminant uptake by LDPE strips fromstagnant sediments. The results indicated that 95% ofthe PAHs and 50% of the PCBs were immobile on a timescale of two months. A comparison of concentrations in porewaters and water columns indicated that a fair degreeof equilibrium existed for PCBs and that one sediment wasa potential source of PAHs. Concentrations of HCB neara former discharge site were higher by a factor of 6 comparedto reference locations.
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