Fig. 4. Sorption isotherms measured for the isolated soil and sediment organic matter (SOM): (a) phenanthrene, (b) naphthalene, (c) 1,3,5-trichlorobenzene (TCB), and (d) 1,2-dichlorobenzene (DCB). Symbols and dashed lines represent data points and the best fit of each sorbent–sorbate data set to the Freundlich sorption equation. C_e, aqueous-phase concentration; K_F, Freundlich capacity parameter; n, isotherm linearity factor; q_e, sorbent-phase concentration.