ALUMINIUM AND IRON PHOSPHATE STUDIES RELATING TO SOILS

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Abstract
Summary: The determination of ion activities in solution during the sorption of phosphate on to gibbsite and hydrous ferric oxide has shown three stages to the reaction: (i) a high energy chemisorption of small amounts of phosphate; (ii) precipitation of a separate phosphate phase; (iii) a low energy sorption of phosphate on to the precipitate. The values of ion activity products for the precipitation reaction do not correspond with the solubility constants of variscite and strengite. Ion activity products are not likely to be useful for indicating the existence of separate A1 and Fe phosphate phases in soils. The variation of solution phosphate activity with phosphate sorbed is suggested as a basis for a ‘phosphate characteristic’ curve for phosphate‐reactive heterogeneous systems.

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