FIXATION OF POTASSIUM BY CLAYS SATURATED WITH DIFFERENT CATIONS

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Abstract
After a 21-day treatment with various bases, fixation of radioactive K on micaceous colloids was studied with respect to the cation on that colloid. The fixation was found to be very low when the clay was saturated with H, K, or NH4, but very high when saturated with Ca and Na. The results were similar when the readily exchangeable bases were replaced by (C2H5)4NI prior to fixation. This indicates that the replaced bases had occupied vacant places resulting from the release of fixed K. Similar studies with ground biotite revealed very low fixation values for H- and NH4- biotite. These expts. have demonstrated the intimate relationship between the adsorbed ions and the degree of fixation of subsequently added K.

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