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An experimental study of phase‐sensitive ac voltammetry in continuous‐flow streams—reversible systems
Author(s) -
Kingsley Edward D.,
Curran David J.
Publication year - 1990
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140020403
Subject(s) - volumetric flow rate , analytical chemistry (journal) , alternating current , diffusion , voltammetry , horizontal scan rate , amplitude , phase (matter) , electrode , flow (mathematics) , harmonic , instrumentation (computer programming) , voltage , current (fluid) , chemistry , materials science , cyclic voltammetry , thermodynamics , mechanics , chromatography , electrochemistry , physics , optics , acoustics , organic chemistry , computer science , operating system , quantum mechanics
Fundamental harmonic ac voltammetry at flow‐by wall electrodes was found experimentally to be independent of the flow rate for rates from 0 to 2.1 L/min. Measurements were made with phase‐sensitive instrumentation. The ac peak current dependence on the concentration, the frequency and amplitude of the applied ac voltage, and the dc scan rate was the same in flowing or stationary solutions. The shape of the ac voltammogram was also not influenced by the flow rate. These results are general for experimental conditions that produce unrestricted diffusion and that maintain simple, reversible electron‐transfer mechanisms.