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Nitrate Adsorption: I. In Some Acid Soils of Mexico and South America
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1971
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Soil GasEnvironmental ChemistryBiogeochemistryChemical EngineeringSouth AmericaEngineeringEnvironmental EngineeringSoil ScienceSoil PollutionSoil ChemistryEnvironmental RemediationAcid SoilsSoil MineralogyGeochemistryNitrate AdsorptionAbstract Nitrate AdsorptionMineral ProcessingSoil Biochemistry
Abstract Nitrate adsorption by subsoils of Andepts, Oxisols, and Alfisols from Mexico and South America was studied using a batch‐type technique. Nitrate adsorption increased as the acidity of the suspension increased to about pH 3.5. This increase was directly proportional, but not equivalent, to the amount of hydrogen ion added. The adsorption of NO 3 ‐ was concentration‐dependent and was described by a Langmuir type isotherm when NO 3 ‐ concentration was above 0.03 N for Andepts and above 0.08 N for Oxisols and Alfisols. Adsorption maxima and affinity constants of Andepts were twice as large as those of other soils. A significant correlation was observed between the amount of NO 3 ‐ adsorbed and the content of amorphous inorganic materials extractable with 0.5 N NaOH.