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This article in SSSAJ

  1. Vol. 37 No. 1, p. 25-28
     
    Received: May 3, 1972
    Accepted: Sept 21, 1972


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doi:10.2136/sssaj1973.03615995003700010013x

Artificial Weathering of Oxidized Biotite: I. Potassium Removal by Sodium Chloride and Sodium Tetraphenylboron Solutions1

  1. R. J. Gilkes,
  2. R. C. Young and
  3. J. P. Quirk2

Abstract

Abstract

The rate of release of interlayer potassium from biotite to NaCl and NaCl/sodium tetraphenylboron solutions is determined by the oxidation state of octahedral iron. Octahedral cation vacancies are generated when octahedral iron is oxidized resulting in a change of orientation of hydroxyl from perpendicular to the mica layer to parallel. This in turn produces a more stable environment for interlayer potassium. Infrared absorption measurements show that the abundance of inclined hydroxyl bears a negative linear relation with the amount of potassium removed by leaching.

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