Nitrate Adsorption: II. In Competition with Chloride, Sulfate, and Phosphate1
- T. Kinjo and
- P. F. Pratt2
In 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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