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Square-wave Anodic Stripping Voltammetry of Lead and Cadmium at Cylindrical Graphite Fiber Microelectrodes with in Situ Plated Mercury Films by Marek Wojciechowski; John Balcerzak is a Chemistry article available to read on EtoBox.

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## Abstraet Square-wave anod~c strippmg voltammetry (SWASV) at a cyhndrtcal, 8-gm graphite fiber microelectrode wtth an m situ plated thm mercury film was investigated in oxygen-free and au-saturated soluttons contammg hrgh and low concentrattons of a supportmg electrolyte. Owing to the non-planar (cylmdrical) drffusion-enhanced mass transport at the rmcroelectrode surface, very htgh steady-state current densities were observed at the rmcroelectrode, e.g. 1.2 mA 1 mmol-' cm-2 for a -1.0 V reduction of 0.59 mM Hg(II) m 0.1 M acetate buffer. To obtain such htgh current densities at a conventtonal rotatmg disk electrode (RDE), the RDE must be rotated at 1600 rpm. Because of the high speed and background rejectron features of square-wave voltammetry, SWASV measurements (without background subtraction) of lead and cadmium at the in situ mercury-plated mrcroelectrodes are not affected by the presence of dissolved oxygen, desptte a htgh yield of oxygen drffusion to the rmcroelectrode. Enhanced SWASV peaks were recorded for lead and cadmmm in mdlimolar solutions of supportmg electrolytes. In a non-deaerated and quiescent solutron of 0.84 mM acetate buffer, for example, the method yielded a

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Author

Marek Wojciechowski; John Balcerzak

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)

Published

1991

Language

EN

Field

Chemistry (Physical Sciences)