Pedosphere 2(3): 245--254, 1992
ISSN 1002-0160/CN 32-1315/P
©1992 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Adsorption of Potassium and Sodium Ions by Variable Charge Soils
Institute of Soil Science, Academia Sinica, P. O. Box 821, Nanjing 210008
      Adsorption of potassium and sodium ions by four typical variable charge soils of South China was studied. The results indicated that the variable charge soils saturated with H and Al showed a much higher preference for potassium ions relative to sodium ions, and this tendency could not be changed by such factors as the pH, the concentration of the cations, the dielectric constant of solvent, the accompanying anions and the iron oxide content etc., suggesting that this difference in affinity is caused by the difference in the nature of the two cations. It was observed that a negative adsorption of sodium ions by latosol and lateritic red soil in a mixed system containing equal amount of potassium and sodium ions at low pH, which is caused by a competitive adsorption of potassium and sodium ions and repulsion of positive charge on the surfaces of soil particles for cations.
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Citation: Li, H. Y. and Ji, G. L. 1992. Adsorption of Potassium and Sodium Ions by Variable Charge Soils. Pedosphere. 2(3): 245-254.
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