Thermo Scientific Dionex ICS-5000, Operator'S Manual

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Dionex ICS-5000 Operator’s Manual
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Doc. 065342-06 12/11
9.28.6 Calibrating the pH-Ag/AgCl Reference Electrode
When to Calibrate
•
Calibrate after installing a new pH-Ag/AgCl reference electrode.
Items Needed
•
A buffer solution with a pH of 7.00
•
A second buffer solution with a different pH (typically one that matches
the pH of the eluent used in your application; in most cases, this is either
pH 10 or pH 4)
pH-Ag/AgCl Reference Electrode Calibration Procedure
1. Complete the following if you are calibrating an electrode that is currently
in use:
a. Follow the instructions in Section 9.28.1 to turn off the cell voltage,
stop the pump flow, and disconnect the cell from the detector.
b. Unscrew the pH-Ag/AgCl reference electrode and remove it from the
cell body (see Figure 9-56 ).
c. To remove any precipitated salt, rinse the pH-Ag/AgCl reference
electrode thoroughly in ASTM Type I (18 megohm-cm) filtered and
deionized water that meets the specifications listed in
Section 1.5 .
2. With the pH-Ag/AgCl reference electrode removed from the cell, connect
the cell and electrode electrical cables to the detector.
3. On the Chromeleon 7 ePanel Set, click the ED tab; on the Chromeleon 6.8
panel tabset, click the EC Detector tab.