| Title: |
Hydration of Cations Adsorbed on a Clay Surface from the Effect of Water Activity on Ion Exchange Selectivity |
| Authors: |
Laudelout, H., Van Bladel, R., Robeyns, J. |
| Source: |
Soil Science Society of America Journal; January 1972, Vol. 36 Issue: 1 p30-34, 5p |
| Abstract: |
Ion exchange equilibria for four pairs of singly charged ions in a montmorillonite clay were carried out at different total normalities of the equilibrium solution at 25C. Only the trace region for the preferred ion was investigated. The effect of solvent activity awon the selectivity coefficient Kcwas established. In each case the expected linear relationship between ln Kcand ln awwas observed. The values for the differences of the ion hydration numbers, nwA‐ nwB, calculated from this purely thermodynamic relationship, were consistent and were comparable with values that could be deduced from basal spacings or anion exclusion volume data. |
| Database: |
Supplemental Index |
