Abstract
Soil-water distribution coefficients (Kd) were determined for polyaromatic hydrocarbons (PAHs) present in eight separate field samples. The eight samples were from three different sites that contained residues from manufacturing gas plant operations. The experimentally obtained Kd values were determined using batch equilibrium studies conducted over a 7 day period. Aqueous and solid-phase PAH concentrations were measured, a pore-water concentration (Cpw) was determined, and an experimental sample-water distribution coefficient (Kd) was calculated for each PAH in each sample. The experimental Kd values were compared to Kd values estimated using literature values of Koc and the fraction of organic carbon (foc) in the samples (Kd=Koc⋅foc). The comparisons indicated that the experimentally obtained Kd values were larger than the estimated Kd values; some experimental Kd values were over 100 times greater than the estimated values. The differences between the experimental sample-specific Kd values and the esti...
Published Version
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