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A Transport Model with Coupled Ternary Exchange and Chemisorption Retention for Hydrazinium Cations

^a Soil & Water Science, P.O. Box 110290, 2169 McCarty Hall, Univ. of Florida, Gainesville, FL 32611-0290
^b Civil and Environmental Engineering, Brigham Young Univ., 368 Clyde Building, Provo, UT 84602

View larger version (22K): [in a new window]   Fig. 1. Observed (discrete points) N2H+5 and Ca2+ breakthrough curves (BTCs) in effluent from an Arredondo Ap soil column injected with a pulse of high hydrazinium concentration (22.15 molc m-3). Simulated BTCs with (smooth lines) and without chemisorption (broken lines) of exchange-phase N2H+5 are given.

View larger version (20K): [in a new window]   Fig. 2. Observed (discrete points) N2H+5 and Ca2+ breakthrough curves (BTCs) in effluent from an Arredondo Ap soil column injected with a pulse of medium hydrazinium concentration (5.64 molc m-3). Simulated BTCs with (smooth lines) and without (broken lines) chemisorption of exchange-phase N2H+5 are given.

View larger version (19K): [in a new window]   Fig. 3. Observed (discrete points) N2H+5 and Ca2+ breakthrough curves (BTCs) in effluent from an Arredondo E1 soil column injected with a pulse of high hydrazinium concentration (15.00 molc m-3). Simulated BTCs with (smooth lines) and without (broken lines) chemisorption of exchange-phase N2H+5 are given.

View larger version (19K): [in a new window]   Fig. 4. Observed (discrete points) N2H+5 and Ca2+ breakthrough curves (BTCs) in effluent from an Arredondo E1 soil column injected with a pulse of medium hydrazinium concentration (5.70 molc m-3). Simulated BTCs with (smooth lines) and without (broken lines) chemisorption of exchange-phase N2H+5 are given.

View larger version (19K): [in a new window]   Fig. 5. Observed (discrete points) N2H+5 and Ca2+ breakthrough curves (BTCs) in effluent from an Arredondo E2 soil column injected with a pulse of high hydrazinium concentration (16.66 molc m-3). Simulated BTCs with (smooth lines) and without (broken lines) chemisorption of exchange-phase N2H+5 are given.

View larger version (18K): [in a new window]   Fig. 6. Observed (discrete points) N2H+5 and Ca2+ breakthrough curves (BTCs) in effluent from an Arredondo E2 soil column injected with a pulse of medium hydrazinium concentration (5.45 molc m-3). Simulated BTCs with (smooth lines) and without (broken lines) chemisorption of exchange-phase N2H+5 are given.

View larger version (17K): [in a new window]   Fig. 7. Observed (discrete points) H+ breakthrough curve (BTC) in effluent from an Arredondo Ap soil column injected with a pulse of high hyrdazinium concentration (22.15 molc m-3). Simulated BTCs with (smooth lines) and without (broken lines) chemisorption of exchange-phase N2H+5 are given.

View larger version (20K): [in a new window]   Fig. 8. Simulated exchange isotherms (solid circles; upper line) for N2H+5 for Arredondo Ap soil calculated from binary exchange selectivity coefficients used in transport simulations. A sorption isotherm (open circles; lower line) that includes both ion exchange and N2H+5 chemisorption was obtained by dividing the sorbed phase concentration by ST rather than STef. The terms Co and Ce represent initial and final N2H+5 concentrations in the solution phase.