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This article in SSSAJ

  1. Vol. 38 No. 3, p. 529-532
    Received: Sept 29, 1973
    Accepted: Jan 8, 1974

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Artificial Weathering of Oxidized Biotite: IV. The Inhibitory Effect of Potassium on Dissolution Rate1

  1. R. J. Gilkes and
  2. R. C. Young2



Rates of dissolution of oxidized biotites in 0.1M 0.01M HCl are severely depressed in the presence of 1M KCl. The amounts of Al, Mg, Mn dissolved in the first extraction are similar to those found without KCl, however, subsequent extractions remove these elements at 10–20% of the corresponding HCl rates. This effect may be due to a decreased rate of vermiculite formation, thereby reducing the effective basal area exposed to attack. A decrease in dissolution rate with increasing ferric iron content was still apparent in the presence of 1M KCl.

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