9 • DC Service
Doc. 065031-04 1/08 317
9.24.3 Polishing an Amperometry Cell Working Electrode
These instructions are for conventional (nondisposable) working
electrodes only. Do not polish disposable electrodes.
When to Polish the Working Electrode
• Polish carbohydrate gold, platinum, silver, and glassy carbon working
electrodes before initial installation in the amperometry cell. Do not
polish new AAA gold electrodes before installation.
• After the working electrode is polished and installed, background
signal and analyte sensitivity require several hours to stabilize. Once
stabilized, do not polish the electrode unless you observe a loss of
signal or severe electrode recession.
Items Needed
• Polishing kit (P/N 036313) shipped with the electrode. The kit
contains polishing pads (P/N 036321), a bottle of fine polishing
compound (P/N 036318), and a bottle of coarse polishing compound
(P/N 036319).
• Pen that writes with indelible ink
• Gloves
• Tweezers
Working Electrode Polishing Procedure
NOTE To avoid electrode fouling, always wear gloves when
handling electrodes.
1. Follow the instructions in Section 9.24.2, Step 1 through Step 6 to
remove the working electrode from the cell.
2. Prepare the polishing pads:
a. Using indelible ink, label the plastic side of a pad to designate it
for use with the coarse polishing compound.
b. Label another pad for fine polishing compound; also designate
the working electrode type with which it will be used.
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