Metrohm 791 VA Detector - Manual (Page 28)

3 Operation
791 VA Detector
22
Amalgamated electrode
"Home-made" amalgamated electrodes are prepared as follows:
Base material
6.1204.140 Au tip
Preparation Put a few drops of Hg on the front side of the
electrode and leave it for a few minutes. Knock
off excess Hg and rinse electrode with distilled
water.
Chemical resistance good resistance to acetonitrile, methanol, water
Voltage range –1200 … 0 mV
Regeneration polish electrode with aluminium oxide and re-
amalgamate
3.2.2 Reference electrode
The reference system of the 6.0727.000 Reference electrode (RE) is
Ag/AgCl/c(KCl) = 3 mol /L (see Fig. 5). The electrolyte vessel 41 can be
refilled. The KCl solution has to be renewed every 1 … 2 months.
Ordering designations for KCl solutions: 6.2308.020 (250 mL)
6.2313.000 (1 L)
3.2.3 Auxiliary electrode
A gold electrode is built-in in the detector cell as an auxiliary electrode.