ICS-3000 Ion Chromatography System
62 Doc. 065031-04 1/08
Integrated Amperometric Detection
With integrated amperometric detection (also known as IA or IPAD),
current is integrated at two or more potentials (see Figure 2-25
).
With the example waveform shown in Figure 2-25
, the current is
integrated both while the potential is swept across the metal oxide
formation wave and also during the reverse sweep across the oxide
reduction wave. This technique minimizes baseline shift and the peak
dips that can occur when an eluting analyte’s effect on oxide suppression
is greater than the detector response from the analyte.
As with pulsed amperometric detection, the waveform period repeats
until the end of data acquisition or until another waveform is specified.
Figure 2-25. Example Integrated Amperometry Waveform
Integration
Potential
(Volts)
Time (Seconds)
0.2
04
0.6
0.8
0.0
+0.35
-0.60
.
-0.10
+0.60
E3.
Cleaning Potential
E4.
Reconditioning Potential
E1, E2 E3 E4
E1, E2.
Analytical Potentials
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