Nitrate Adsorption Model for Georgia Variable Charge SubsoilsReportar como inadecuado

Nitrate Adsorption Model for Georgia Variable Charge Subsoils

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Nitrate adsorption in subsoil affects nitrate leaching, which in tum can affect water quality. A model to describe the adsorption of nitrate in acidic variable charge subsoils in Georgia and other tropical and subtropical areas is proposed. In the first step, a portion of the effective charge that vanishes as a result of the overlapping of oppositely charged diffuse layers on different colloids, termed -the mutually neutralized charge-, σsubscript M. is established. The -newly developed charge-, σ subscript N, is developed during the second step, in response to ionic strength increase in subsoil solution. The reestablishment of these two components of the effective charge causes -salt adsorption-. The last step is -ionic exchange- with the corresponding effective charge component σ EX. The separation of -temporarily effective- σsubscript M + σ subscript N from -permanently effective- σ subscript EX portions of the effective charge is very crucial when displacement and transport of ions like N₃- are considered, in order to understand that these ions are only temporarily adsorbed and can be immediately leached out by rain.

1999 Georgia Water Resources Conference -

Autor: Qafoku, Nikolla P. - Sumner, Malcolm E. - -


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