Abstract
An electrochemical concentration modulator is tested for its applicability as an injection device in correlation chromatography. The use of conventional signals to control the potential of the working electrode in the modulator cell produces ghost peaks in the correlogram. The effects of the modulation interval, the time scale of the control signal and the concentration of an electroactive model compound (hydroquinone) on the pattern of the ghost-peak intensities are described. A simple model, based on the combined action of a charging-current time constant and the relative position of the half-wave potential in the modulation interval, is used to describe the result on the concentration profile of the analyte. The mechanisms responsible for ghost peak generation are described.
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