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This article in SSSAJ

  1. Vol. 35 No. 5, p. 725-728
    Received: Jan 20, 1971
    Accepted: June 8, 1971

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Nitrate Adsorption: II. In Competition with Chloride, Sulfate, and Phosphate1

  1. T. Kinjo and
  2. 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.

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