Abstract
SUMMARYThe sorption of aluminium by an Oxisol in the presence of sulphate or fluoride was studied to determine the effects of these co‐ordinating anions on the distribution of aluminium between the solid and solution phases. Addition of sulphate increased aluminium sorption, probably due to a sulphate‐induced increase in negative surface charge. In contrast, fluoride was found to depress sorption due to the decrease in the average charge of the aluminium‐containing species resulting from the formation of fluoro‐aluminium complexes.The pH of the equilibrium mixtures was linearly related to the pAl3+. This relationship held regardless of the concentrations of fluore or sulphato‐aluminium species. Equilibrium pH and pAl3+ appeared to be controlled by gibbsite.
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