Abstract
A flow injection system was used to introduce a sample in to a flow-through electrochemical cell based on a reticulated vitreous carbon (r.v.c.) electrode. Products of the initial electrolysis are trapped in the porous electrode by stopping the flow. Linear sweep voltammetry under stopped-flow conditions forms the basis of a determination of a reversibly electrolyzed species in the presence of an irreversibly electrolyzed species. The determination of dopamine in the presence of ascorbic acid was used as an illustrative example. Response varied linearly with dopamine concentration between 8 X 10 −7 and 3 X 10 −5 M and the detection limit (S/N = 3) was 5 X 10 −7 M dopamine.
Published Version
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