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Soil Science Society of America Journal Abstract -

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


This article in SSSAJ

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

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



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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