Potassium retention in montmorillonites

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Abstract
The amounts of potassium retained, after exchange with normal ammonium acetate solution at pH 7, were measured with six montmorillonite-beidellite minerals, whose interlayer charge ranged 0·72-1·00 M+/Si8O22 and where tetrahedral substitution of Al for Si ranged 0·14-0·93 M+/Si8O22. The amount of potassium retained increased with increasing interlayer charge, but there was no correlation between the amount of potassium retained and the tetrahedral charge.
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