Abstract
A carbon paste electrode, modified with a macrocyclic thiohydrazone, was used in the determination and kinetic speciation of copper in water samples. Copper was selectively accumulated on the electrode surface at open circuit and its analysis was performed by cyclic voltammetry. A detection limit of 0.5 μg/L (3σ) was found for 10 min of accumulation. The effect of several metallic ions and organic substances on the voltammetric signal was examined. For speciation purposes, a ligand competition methodology between ligands in solution and electrode was used. Model copper complexes were characterized as a function of their dissociation kinetics. The method was applied to water samples from the Jarama River in Madrid.
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