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

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.

¹ Contribution from the Dep. of Soil Science and Plant Nutrition, Institute of Agriculture, University of Western Australia, Nedlands, W.A. 6009. This work was partly supported by the Australian Wheat Council.

² Lecturer in Soil Science, Research Officer and Professor of Soil Science, Department of Soil Science, respectively. Department of Soil Science and Plant Nutrition, University of Western Australia, Nedlands, W.A. 6009.

Received for publication May 3, 1972. Accepted for publication September 21, 1972.

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