An Evaluation of the Use of Cation-Exchange Resin for the Determination of Organically-Complexed Al in Natural Acid Waters

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Abstract
The estimation of organically-complexed monomeric Al (Alorg) using the cation-exchange method developed by Driscoll was evaluated by comparison with equilibrium-dialysis measurements on solutions containing Al and isolated aquatic humic substances at pH 4–5.3. The cation-exchange method underestimates [Alorg] by up to 25%, the extent of the discrepancy increasing with v (mol Al bound/g humic substances). An empirical equation that allows the correction of [Alorg] estimated by cation-exchange is given.