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Soil Science Society of America Journal Abstract -

Retention of Acetate by Montmorillonite1


This article in SSSAJ

  1. Vol. 29 No. 6, p. 670-672
    Received: Mar 29, 1965
    Accepted: June 8, 1965

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  1. F. T. Bingham,
  2. J. R. Sims and
  3. 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 2n acetate salts were required to attain maximum retention, irrespective of salt source. Release studies showed OH-, F-, and H2PO4- to be effective in removing sorbed acetate. On the other hand, SO42- was only partially effective while NO3- and Cl- were ineffective in releasing acetate.

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