Thermo Scientific Dionex ICS-5000, Руководство оператора

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2 • DC Description
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With scanning waveforms, integration occurs while the potential is being
increased linearly over time (see the example scanning waveform in
Figure 2-55 ). Although scanning waveforms are typically not as useful for
quantitative analysis as analytical waveforms, when used to collect 3D
amperometric data, scanning waveforms can be optimized to provide
characteristic I-t plots (see
Section 2.19.5 ). Comparison of I-t plots of a
known substance with an unknown can help to identify unknown peaks or to
determine whether a substance is coeluting with another.
2.19.5 Storing and Reprocessing Amperometry Data
Chromeleon provides storage of 2D and 3D pulsed amperometry and
integrated amperometry data. For 2D data, Chromeleon stores the detector’s
response at each waveform period’s integration interval. One integrated data
point per waveform period is stored. This allows you to produce a
chromatogram similar to the example shown in
Figure 2-56 . The retention
Figure 2-55. Example Scanning Waveform
1.0
-2.5
-1.0
1.0
2.0 0.5
1.5
0.0
0.0
Time (Seconds)
E3.
E4 Negative cleaning potential
. Positive cleaning potential
E1
E2 . Pre-adsorption potential
. Scanning period
Potential
(Volts)
Integration
E1
E2
E3
E4
E1