BASi Reference Electrodes
Silver/Silver Chloride (Ag/AgCl) Reference Electrodes
These compact, glass-bodied reference electrodes are available in two styles. The 7.5 cm long RE-5B reference electrode is used
for voltammetry and polarography experiments using the C-2 and C-3 Cell Stands, the CGME
Controlled Growth Mercury Electrode, the RDE-1 and RDE-2 Rotating Disk Electrodes, and the LCM Low Current Module. The RE-6 reference electrode (3 cm) is used with the CC-5
Cross-Flow Thin-Layer Flow Cell. The RE-4 is also 3 cm long. All electrodes have a 6 mm OD glass body, and use a porous junction (frit) made from either
ceramic (RE-4, RE-6) or Vycor (RE-5B). (Note that, due to the high resistance of the ceramic frit, the RE-6 electrode is only recommended
for aqueous electrolytes.) Both electrodes can be used to suspend three reference electrodes in the salt solution while protecting
the connecting pins and wires from corrosion. If you are doing HPLC with electrochemical detection, go to the LC-EC reference electrode page. Connection to the cell lead is via a gold-plated pin on the end of a flexible plastic-coated wire (RE-5B and RE-6) or stainless steel pin (RE-4). An O-ring is included with each electrode. Between uses, reference electrodes should be stored with junction tips in a MF-5275 vial filled with 3M NaCl.
A double junction reference electrode can be set up using an RE-5B reference electrode with the glass chamber MF-2030. This
chamber also has a Vycor frit, which must be maintained.
Note: The RE-1 (MF-2020 and MF-2024) reference electrode has been discontinued: please order the RE-5B reference electrode
Saturated Calomel Reference Electrode (SCE) Kit
This reference electrode comes in kit form and requires user preparation. The kit includes a glass electrode body in the "H
" design with a porous Vycor frit and a platinum wire electrode lead. Vials containing saturated KCl solution and calomel
paste are provided (please note that mercury is NOT provided, and must be obtained from an alternative source). An instruction
sheet illustrates assembly. The user will need glass pipettes, a pipette bulb, and clean mercury for assembly. Once assembled, the
electrode must be maintained in a stable, upright position, with the Vycor tip continuously wetted. The electrode should be stored
with the tip immersed in a saturated KCl solution.
Non-aqueous Silver/Silver Ion (Ag/Ag+) Reference Electrode Kit
This kit contains the parts required for construction of a non-aqueous silver/silver ion reference electrode. The glass
electrode body has a porous Vycor tip attached with heat shrink tubing. The removable Teflon top contains a silver wire and 0.060
" gold-plated connecting pin for the cell lead. The kit also contains solid silver nitrate, extra heat shrink tubing, and
extra porous Vycor tips. Non-aqueous solvents must be supplied by the user. An instruction sheet illustrates easy assembly.
What properties are required for a reference electrode?
What are the differences between the silver/silver chloride reference electrode and the saturated
calomel reference electrode?
What are liquid junction potentials, and how do they affect measured potentials?
What factors can affect the potential of a reference electrode?
How do I store reference electrodes?
Can I use aqueous reference electrodes for non-aqueous solutions?
I need to use anhydrous electrolyte, so an aqueous reference electrode is not suitable. What are
"Practical Problems in Voltammetry 3: Reference
Electrodes for Voltammetry", A.W. Bott, Current Separations, 14 (1995) 64.