ADSORPTIVE STRIPPING VOLTAMMETRY OF COBALT AND NICKEL IN FLOW SYSTEMS AT WALL-JET ELECTRODES

Adsorptive stripping voltammetry of cobalt and nickel in flow systems at wall-jet mercury thin-film electrodes has been investigated and assessed. A HEPES biological buffer with sodium perchlorate electrolyte was employed with excess nioxime, or dimethylglyoxime, ligand, and the accumulated complex on the mercury film surface determined by differential pulse reduction. Concentrations down to 1 nM can be routinely measured. Results at the wall-jet electrode, supported by evidence from LSV and impedance measurements at rotating and stationary electrodes respectively, show the viability of the method.