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Nitrate Adsorption: II. In Competition with Chloride, Sulfate, and Phosphate
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1971
Year
Chemical EngineeringEnvironmental ChemistryNegative AdsorptionEngineeringIon ExchangeSo 4Environmental Engineering‐ AdsorptionBioremediationEnvironmental RemediationNutrient CycleChemisorptionNitrate AdsorptionAdsorptionChemistryAnion SensingChemical KineticsWaste Management
Abstract In anion‐exchange equilibria studies on two Andepts and one Oxisol, Cl ‐ showed a slight preference over NO 3 ‐ , and SO 4 2‐ and H 2 PO 4 ‐ were greatly preferred over NO 3 ‐ . Negative adsorption of NO 3 ‐ occurred when SO 4 2‐ or H 2 PO 4 ‐ exceeded certain concentrations. Under limited conditions, increases in Cl ‐ , SO 4 2‐ , or H 2 PO 4 ‐ adsorption caused proportional decreases in the amounts of NO 3 ‐ adsorbed. On a mmole basis, the decreases in NO 3 ‐ adsorption equaled the increase in adsorption of other anions, except in the case of H 2 PO 4 ‐ , where about 3 to 4 mmoles of H 2 PO 4 ‐ were adsorbed for a decrease in the adsorption of 1 mmole of NO 3 ‐ , suggesting that H 2 PO 4 ‐ reacts with more sites of the same type and/or with types not available for NO 3 ‐ adsorption.