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Desorption of Phosphate from Kaolinite by Citrate and Bicarbonate¹

ABSTRACT

Phosphate which cannot be desorbed from kaolinite by chloride at the same pH and ionic strength at which adsorption took place is significantly desorbed by citrate and bicarbonate.

In the presence of citrate or bicarbonate, phosphate adsorption by kaolinite is reduced. The extent of reduction depends on the way in which phosphate and citrate or bicarbonate are added to the clay. Maximum reduction in phosphate adsorption occurs when phosphate and citrate or bicarbonate are added together or when phosphate is introduced after citrate or bicarbonate adsorption.

These effects are attributed to the fact that mole for mole exchange between phosphate and the other anion does not occur. The reduction in phosphate adsorption results not only from competition but also from a concomitant change in charge.

¹ Contribution from the Dept. of Soil Science & Plant Nutrition, Inst. of Agriculture, University of Western Australia, Nedlands, W. Australia. The senior author wishes to acknowledge a Colombo Plant Fellowship. The authors wish to thank Mr. F. J. Hingston for his helpful discussions.

² Colombo Plan Research Student, Reader in Soil Chemistry, and Professor of Soil Science, respectively.

Received for publication October 24, 1967. Accepted for publication January 24, 1968.

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