Abstract
An ultrafiltration technique has been adapted to obtain information on the binding of cadmium by a fulvic acid extracted from a deep groundwater. The results obtained are compared to those obtained by the ion-exchange distribution method (Schubert's approach) and an ion selective electrode method. The data obtained have been analyzed taking into consideration the heterogeneity of the fulvic acid sample. Results from the comparison indicate that with a proper design and conditioning of the diaflo membrane, the ultrafiltration technique offers a promising approach with respect to obtaining meaningful information on the binding of trace metals by natural organic acids.
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