The cation- and anion exchange characteristics of soils with a large sesquioxide surface area
1981
Keonigs, F.F.R. | Leffelaar, P.A. | Breimer, T. | Vollenbroek, F.A. (Landbouwhogeschool Wageningen (Netherlands). Dept. of Soils and Fertilizers)
The colloids with a pH-dependent surface potential indicate that the anion exchange capacity of soils containing hematite or similar oxides depends on pH, electrolyte concentration and valency of counter-ions. These relationships were tested for the salinity- and pH-range of importance to agriculture, using a percolation technique. The results were formulated in terms of multiple linear regression equations relating the exchange capacities to pH and the square root of the electrolyte concentration. Consequently, the adsorption behaviour of ferruginous soils cannot be characterized by the determination of CEC and AEC at one level of pH and salt concentration in solution. Due to the inefficiency of the ethanol washing step, 2 standard methods overestimated CEC by a factor of 2 to 4
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