2 • DC Description
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capacity, which is determined by the length of the run and the data sampling
rate.
For direct control, enter the potentials on the DC ePanel in Chromeleon 7 or
the Control panel in Chromeleon 6.8.
2.19.2 Integrated and Pulsed Amperometric Detection
Integrated and pulsed amperometric detection are similar to DC amperometry
(see
) in that molecules are oxidized or reduced at the surface of
an electrode. However, with these detection modes, a series of potential
changes is repeated over time. By repeatedly pulsing between optimized high
positive and negative potentials, the electrode surface is continually
regenerated. Current is measured by integration during a portion of the
repeating potential vs. time waveform. See
for more
information about waveforms.
Pulsed Amperometric Detection
In pulsed amperometric detection (PAD), current is integrated at a single
constant potential (see
The potentials, labeled E1, E2, and E3, are applied for durations t1, t2, and t3,
respectively. At t1, the E1 potential is applied. After a delay, the signal is
Figure 2-50. Example Pulsed Amperometry Waveform
Integration
Potential
(Volts)
Time (Seconds)
0.2
0.4
0.0
0.6
+0.1
+0.7
t1
t2
t3
Delay
-0.1
E1
E2
E3
E3
. Negative Cleaning
E2
. Positive Cleaning
E1
. Detection Potential
Potential
Potential
Содержание Dionex ICS-5000
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