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Soil Science Society of America Journal Abstract -

The Effect of Hydroxy-Al and Hydroxy-Fe Polymers on Montmorillonite Particle Size1


This article in SSSAJ

  1. Vol. 44 No. 3, p. 626-629
    Received: Apr 17, 1978
    Accepted: Feb 11, 1980

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  1. H. Frenkel and
  2. I. Shainberg2



Potentiometric and photometric titration of Al- and Fe-montmorillonite suspensions with NaOH and Na2B4O7 are presented. Hydroxy-Al polymers formed during the neutralization reaction apparently acted as cementing agents and prevented the dispersion of the structure. When an excess of NaOH is added, the hydroxy-Al polymers disintegrate and complete dispersion of the Na-montmorillonite takes place. No aluminates are formed upon neutralization of Al-montmorillonites with Na3B4O7, and hence no dispersion takes place.

Neutralization of Fe-montmorillonite suspension with NaOH and Na2B4O7 resulted in gradual breakdown of the Fe-montmorillonite particles. Hydroxy-Fe polymers were not as effective in preventing the dispersion of the particles by adsorbed Na as hydroxy-Al polymers.

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