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TECHNICAL REPORT
Ground Water Quality

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

* Corresponding author (rsm{at}gnv.ifas.ufl.edu)

Received for publication October 27, 2000. A numerical model was developed to describe the fate and transport of hydrazinium and competing Ca²⁺ and H⁺ cations applied in acidic solutions to columns of Ca²⁺/H⁺–saturated sandy soil during steady saturated flow conditions. Instantaneous ternary H⁺–Ca²⁺–N₂H⁺₅ cation exchange using the Gaines–Thomas approach was combined with second-order, irreversible, kinetic chemisorption of exchange-phase N₂H⁺₅ ions as major retention mechanisms for N₂H⁺₅. Exchange-mediated chemisorption is assumed to occur as chemical binding of N₂H⁺₅ ions located on carboxyl-group exchange sites to nearby carbonyl groups, consequently decreasing the effective soil cation exchange capacity (CEC). Comparison of simulated and observed breakthrough curves (BTCs) for concentrations of N₂H⁺₅ and Ca²⁺ ions in column effluent was used in model evaluation. The cation transport model with cation exchange coupled with exchange-mediated chemisorption provided a valid first approximation for N₂H⁺₅ transport.

Abbreviations: BTC, breakthrough curve • CEC, cation exchange capacity

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