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Published in Soil Sci Soc Am J 24:191-194 (1960)
© 1960 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Chemical Extraction of Potassium from Soils and Micaceous Minerals With Solutions Containing Sodium Tetraphenylboron. I. Preliminary Experiments1

A. D. Scott, R. R. Hunziker and J. J. Hanway2

ABSTRACT

Soils and micaceous minerals were extracted with NaBPh4-salt solutions to determine the ease with which nonexchangeable K can be removed when the blocking effect of fixable cations is reduced. Essentially all of the K in vermiculite, 12% of the K in muscovite and as much as 47% of the K in illite was extracted by the NaBPh4-salt solutions even though most of the K in these materials was otherwise nonexchangeable with Na or NH4. The NaBPh4 reduced the blocking effect by precipitating the fixable cations.

The K in micaceous minerals was removed more effectively by successive extractions with NaBPh4-salt solutions than it was by one continuous extraction because some of the K that had been precipitated was readsorbed by the mineral when the KBPh4 was removed with acetone.

The NH4 adsorption capacity of illite was increased by removing K with NaBPh4 solutions, but the increase was less than the amount of K removed. Most of the NH4 adsorbed as a result of the NaBPh4 treatment was fixed.

NOTES

1 Journal Paper No. 3756 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project No. 1234.

2 Professor of Soils, former graduate student (present address, University of Florida, Citrus Exp. Sta., Ft. Pierce) and Professor of Soils, respectively.

Received for publication November 19, 1959. Accepted for publication February 2, 1960.






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