Retention of Acetate by Montmorillonite1
- F. T. Bingham,
- J. R. Sims and
- A. L. Page2
Acetate retention was measured by treating suspensions of montmorillonite with C14-labeled acetate solutions, removing excess acetate by washing with methanol, and determining the acetate remaining by C14 assay of the clay. The amount of acetate retained by montmorillonite was found to be dependent upon the concentration of salt used, pH of the system, and concentrations of competitive anions.
Maximum acetate retention (0.05 meq acetate/g clay) occurred over the pH range of 2 to approximately 6. Increases in pH above 6 resulted in marked reductions in acetate retention. Under uniform conditions of pH (≅ 5.5), concentrations of approximately 2
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