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Time course of fractional uptake of PCB 153 (hexachlorobiphenyl) in a 77 μm POM sheet (Hawthorne et al., 2009) from a sediment slurry. A first order model fit illustrates the conditions required for equilibrium sampling (i.e., t ≥ 3/ke) and for linear non-equilibrium sampling (i.e., t ≤ 0.5/ke). The intermediate, shaded region illustrates the period when uptake into the polymer is nonlinear.
