2 • DC Description
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2.19.3 Cyclic Voltammetry
The determination of the optimum potentials to use in amperometry begins
with an electrochemical technique called voltammetry, in which the current
that results from oxidation or reduction reactions is measured against the
voltage applied to the system. The applied voltage is changed (scanned)
within preset limits.
Chromeleon 6.8 supports cyclic voltammetry. In cyclic voltammetry, the
voltage is first scanned in one direction and then reversed so that the voltage
at the end of the scan is the same as at the beginning. This results in a
triangular waveform (see
In the cyclic voltammetry mode, the detector measures the current at a rate of
1 kHz (i.e., 1000 raw data points per second are collected). The data is
compressed before storage to 20 Hz.
2.19.4 Waveforms
A waveform is a series of steps, defined as points on a plot of potential vs.
time. Waveforms must be defined for the cyclic voltammetry and integrated
amperometry modes.
Cyclic Voltammetry Waveforms
Cyclic voltammetry waveforms are defined by three points, each with a time
and a potential. The waveform forms a triangle, with the first point always at
time zero and the first and third points always having the same potential.
Summary of Contents for Dionex ICS-5000
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