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Published in Soil Sci Soc Am J 26:437-440 (1962)
© 1962 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Kinetics of Potassium Release from Biotite and Muscovite in Sodium Tetraphenylboron Solutions1

M. G. Reed and A. D. Scott2

ABSTRACT

A mathematical expression that describes the release of interlayer K from mica particles in NaCl-NaTPB solutions was derived. The mica particles were assumed to be circular discs and the rate determining process for the release of K was considered to be the simultaneous diffusion of K and Na within the particle. Therefore, this derivation involved the solution of a two-dimensional radial diffusion problem in which K diffuses from a receding weathering front to the periphery of the particle.

The validity of these assumptions and the resulting expression was evaluated with experimentally determined K release data. The experimental data were obtained with different size fractions of biotite and muscovite placed in NaCl-NaTPB solutions for different periods of time. The results obtained with each size fraction were accurately described by the theoretical expression. In the case of a 50 to 62µ biotite fraction, this was true even though 90% of the K was released in a period of 113 hours. On the other hand, the expression did not account for the effect of particle size. A modification of the expression, based on the experimental results, however, accounted for the effects of both time and particle size.

NOTES

1 Journal Paper No. J-4203 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project No. 1234. Presented before Div. II. Soil Science Society of America, Chicago, Ill., Dec. 8, 1960. This work was supported in part by the American Potash Institute.

2 Research Associate and Professor of Soils, respectively.

Received for publication October 14, 1961. Accepted for publication March 6, 1962.






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