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Potassium Uptake by Cation-Exchange Resin Amberlite IR-120 from Fithian Illite¹

ABSTRACT

The rate of K uptake by the hydrogen form of Amberlite IR-120 from Fithian illite was studied. Resin-illite ratio, time in contact of illite with the resin, temperature, and repeated treatment effect on the release of K were investigated. The amount of released K increased as the resin-illite ratio, time in contact, and temperature increased. It seems probable that amberlite IR-120 attacks mainly the surface parallel to the c-axis of illite crystals. Thus, even after a long treatment of illite with the hydrogen form of amberlite, illite keeps its cation-exchange capacity value, crystal structure, and almost all of its K content. X-ray graphs of the resin-treated illite samples after their Mg saturation and ethylene glycol solvation do not present any clear evidence of alteration of illite to expanding lattice type clay minerals.

¹ Contribution from the Soils Laboratory, Aristotelian University of Thessaloniki, Thessaloniki, Greece.

² Assistant Professor and Professor of Soil Science, respectively, University of Thessaloniki.

Received for publication October 16, 1962. Accepted for publication January 25, 1963.