Dionex ICS-3000, Руководство оператора

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2 • DC Description
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2.16 ED Electrochemical Detector
One or two ICS-3000 Electrochemical Detectors (EDs) can be installed in the DC.
Each complete ED assembly consists of an amperometry cell and the detector
electronics required to collect data and send it to the computer and the analog
output (if installed). The detector is installed in the upper compartment of the DC
(see
Figure 2-13 ). The cell mounts on the front of the detector. The detector
electronics are not accessible to the user.
The ED can perform the following electrochemical detection modes:
•
DC amperometry (see Section 2.16.3 )
•
Integrated amperometry (includes pulsed amperometry) (see Section 2.16.4 )
•
Cyclic voltammetry (see Section 2.16.5 )
2.16.1 Amperometry Cell
The ED amperometry cell is a three-electrode voltammetric cell. It is a
miniature flow-through cell with a titanium cell body (the counter
electrode), a working electrode, and a combination pH-Ag/AgCl
reference electrode (see
Figure 2-22 ). The type of working electrode used
depends on the application. Four conventional (non-disposable) working
electrode types are available: gold, platinum, silver, and glassy carbon.
Three disposable working electrodes types are available: gold, silver, and
platinum.
Figure 2-22. Amperometry Cell (Titanium Cell Shown)
Working Electrode
1
Cell Body
(counter electrode)
2
3
Reference
Electrode
1
2
3