Abstract
The voltammetric behaviour and measurement of diltiazem at mercury and carbon electrodes are discussed. Controlled interfacial accumulation of diltiazem on a hanging mercury drop electrode provides the basis for a sensitive adsorptive stripping voltammetric procedure. The effects of various operational parameters on the stripping response are discussed. With 3 min pre-concentration, an 11-fold enhancement of peak current was observed, resulting in a detection limit of 4 × 10–9M. The anodic response of diltiazem at carbon electrodes was used for amperometric detection for flowing streams. Flow injection measurements yielded a detection limit of 1.5 ng.
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