Surface complexation model of cation adsorption on humic soils: 2. K+-ca2+exchange equilibria

Osamu Nakahara, Shin Ichiro Wada

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6 Citations (Scopus)


We evaluated the ability of a new surface complexation model “multi-layer model” of Nakahara and Wada (1995: Soil Sci. Plant Nutr., 41, 659-669) to predict the K+-Ca2+exchange equilibria on a humic Andisol. Under the assumption that the relative permittivity of the interfacial region is constant at any points, we could calculate the K+-Ca2+exchange equilibrium conditions using the four parameters previously obtained from K+and Ca2+adsorption data. The model predicted the variation of the exchange selectivity coefficient of Van-selow (K V) and the pH of the bathing solutions as a function of the equivalent fraction of adsorbed K+satisfactory. We concluded that our model can be used for the calculation of the chemical equilibria of soil solutions of humic soils.

Original languageEnglish
Pages (from-to)671-679
Number of pages9
JournalSoil Science and Plant Nutrition
Issue number4
Publication statusPublished - Dec 1995

All Science Journal Classification (ASJC) codes

  • Soil Science
  • Plant Science

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