Abstract
CONSIDERABLE acceptance of a ready exchange of structural OH of clay minerals by fluoride ions has been reported1; however, so far the evidence rests mainly on the appearance of OH in an extraction solution of potassium fluoride. Recently it was found2 that the hydrochloric acid titratable OH formed on the reaction of clay minerals and soils in neutral 1 N potassium fluoride solution results from the complexing reaction by fluoride ions and dissolution of structural aluminium or iron from the minerals, by a reaction that can be represented as:
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