Abstract
AbstractIn anion‐exchange equilibria studies on two Andepts and one Oxisol, Cl‐ showed a slight preference over NO3‐, and SO42‐ and H2PO4‐ were greatly preferred over NO3‐. Negative adsorption of NO3‐ occurred when SO42‐ or H2PO4‐ exceeded certain concentrations. Under limited conditions, increases in Cl‐, SO42‐, or H2PO4‐ adsorption caused proportional decreases in the amounts of NO3‐ adsorbed. On a mmole basis, the decreases in NO3‐ adsorption equaled the increase in adsorption of other anions, except in the case of H2PO4‐, where about 3 to 4 mmoles of H2PO4‐ were adsorbed for a decrease in the adsorption of 1 mmole of NO3‐, suggesting that H2PO4‐ reacts with more sites of the same type and/or with types not available for NO3‐ adsorption.
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