抄録
Some of the problems associated with the application of the existing thermodynamics of ion exchange for the description of ion adsorption on variable charge soils are discussed. A major problem is the difficulty in saturating the surface functional groups of variable charge materials with ions other than H+ or OH−, i.e., the difficulty in obtaining complete exchange isotherms. It was shown that this difficulty could be overcome by choosing appropreate standard states of exchanger phase components. A set of equations that relate the exchanger phase activity coefficients and thermodynamic equilibrium constant to the selectivity coefficient were derived based on a nonconventional asymmetric reference system. The terms related to adsorbed water activity that appear in the derived equations were found to be non-significant for some variable charge materials.
本文言語 | 英語 |
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ページ(範囲) | 191-200 |
ページ数 | 10 |
ジャーナル | Soil Science and Plant Nutrition |
巻 | 37 |
号 | 2 |
DOI | |
出版ステータス | 出版済み - 6月 1991 |
!!!All Science Journal Classification (ASJC) codes
- 土壌科学
- 植物科学