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Sorption of Apolar Aromatic Compounds to Soil Humic Acid Particles Affected by Aluminum(III) Ion Cross-Linking

Department of Soil and Water, Connecticut Agricultural Experiment Station, 123 Huntington Street, New Haven, CT 06511

View larger version (13K): [in a new window]   Fig. 1. Sorption uptake rates of (a) 1,2,4-trichlorobenzene (TCB) on hydrogen-ion-exchanged (H-HA) and aluminum-ion-exchanged (Al-HA) humic acids and (b) naphthalene on H-HA. Arrows indicate equilibration times used for isotherms.

View larger version (27K): [in a new window]   Fig. 2. Sorption isotherms of (a) 1,2,4-trichlorobenzene (TCB) and (b) naphthalene on hydrogen-ion-exchanged (H-HA) and aluminum-ion-exchanged (Al-HA) humic acids. Lines are Freundlich and dual-mode model (DMM) fits.

View larger version (21K): [in a new window]   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 (Kd) as a function of C. Lines are dual-mode model (DMM) fits for the sorption isotherms. Each concentration has duplicates.

View larger version (13K): [in a new window]   Fig. 4. Index of irreversibility (I) for (a) 1,2,4-trichlorobenzene (TCB) and (b) naphthalene in hydrogen-ion-exchanged (H-HA) and aluminum-ion-exchanged (Al-HA) humic acids. Negative values were truncated to zero and only their error bars are shown if they protrude into the positive zone.

View larger version (14K): [in a new window]   Fig. 5. Comparison of competition between 1,3-dichlorobenzene (DCB) and 1,2,4-trichlorobenzene (TCB) in hydrogen-ion-exchanged (H-HA) and aluminum-ion-exchanged (Al-HA) humic acids. The terms q0TCB and K0d TCB are the sorbed concentration of TCB and apparent sorbent-to-water distribution coefficient in the absence of DCB, respectively.