Adsorptive stripping voltammetry of cobalt and nickel in flow systems at wall-let 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 b!, differential pulse reduction. Concentrations down to 1 nM can be routinely measured. Kesults 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.

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