Test of Σ polycyclic aromatic hydrocarbon model at a creosote‐contaminated site, Elliott Bay, Washington, USA

At a creosote-contaminated site, 33 individual polycyclic aromatic hydrocarbon (PAH) compounds were quantified in sediment and interstitial water (IW) at 30 stations. These compounds included the 13 parent PAHs from the ΣPAH model, 7 additional parent, and 13 alkylated compounds. Fourteen groups of alkylated compounds were also quantified in sediment extracts. Amphipod mortality using the ΣPAH model was predicted within ±10% of the observed when freely dissolved concentrations of PAHs with log K ow S 500 ppm dry). However, most compounds were not in equilibrium with the sediment at stations with lower bulk concentrations but were in equilibrium with dissolved organic matter throughout the study area.