Figure 2. Equilibrium PCB concentrations on AC, qe, for the indicated PCB congeners on virgin TOG (_, solid line), DOM-loaded TOG (_, dashed line), and biofilm-covered TOG (_, dotted line) AC on an AC mass basis corresponding to an aqueous concentration of (A) 0.1 ng/L, (B) 10 ng/L, (C) 100 ng/L, and (D) 1000 ng/L. Error bars represent the geometric mean 95% confidence intervals. Virgin Sigma-Aldrich AC is also included (_, no line) based on data from Jonker and Koelmans (17)).