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Desorption of Phosphate from Kaolinite¹

ABSTRACT

Initially all the phosphate adsorbed onto kaolinite is isotopically exchangeable. On washing some of the phosphate ceases to be exchangeable, but if the amount that remains labile is plotted against the solution concentration the original isotherm is preserved. Thus, some of the total phosphate goes into a nonexchangeable "fixed" sink.

If phosphate is adsorbed in very small increments some of it is converted directly into the fixed form. In the presence of large concentrations of phosphate, all the adsorbed phosphate becomes exchangeable.

¹ Contribution from the Dep. of Soil Science and Plant Nutrition, Inst. of Agr., Univ. of Western Australia, Nedlands, W. Australia. The senior author wishes to acknowledge a Postdoctoral Fellowship provided by the Soil Fertility Fund of Western Australia.

² Soil Scientist, Dep. of Soil Chemistry and Plant Nutrition, Volcani Inst, of Agr. Res., Rehovot, Israel, Reader Sand Chemistry and Professor of Soil Science, Dep. of Soil Science Plant Nutrition, Univ. of Western Australia, Nedlands.

Received for publication August 22, 1966. Accepted for publication December 20, 1966.