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Nitrate Adsorption: II. In Competition with Chloride, Sulfate, and Phosphate
Author(s) -
Kinjo T.,
Pratt P. F.
Publication year - 1971
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1971.03615995003500050028x
Subject(s) - adsorption , chemistry , sulfate , phosphate , inorganic chemistry , chloride , nitrate , oxisol , ion exchange , nuclear chemistry , ion , medicinal chemistry , organic chemistry , soil water , environmental science , soil science
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.