Comparison of two kinetic approaches for copper speciation using ion-exchange columns and ion-exchange modified carbon paste electrodes

A comparison of speciation data for copper by using an anodic stripping vol tammetric procedure on a chemically modified electrode and an ion-exchange column procedure was made. An Amberlite IRC-718 resin was employed in both the methods. In the ion-exchange column method, the time scale of the measu rement was varied between 0.2 and 150 s, in order to obtain kinetic informa tion. The measurement time in the chemically modified electrode procedure w as evaluated and remained constant. Both the procedures were used to invest igate model complexes of copper and natural water samples. For similar meas urement times, similar metal availability was observed for both, the electr ochemical and chromatographic approaches. Better kinetic information can be obtained with an ion-exchange column procedure when metal ion is present i n the sample as several complexed forms. (C) 1999 Elsevier Science B.V. All rights reserved.