Fig. 3. Effect of Al³⁺–cross-linking of HA on sorption-desorption hysteresis of (a) 1,2,4-trichlorobenzene (TCB) and (b) naphthalene, represented by apparent solid-to-water distribution coefficient (K_d) as a function of C. Lines are dual-mode model (DMM) fits for the sorption isotherms. Each concentration has duplicates.