Reference electrode for Non Aqueous solution

This electrode is silver-silver ion reference electrode for non-aqueous solution.
In order to reduce the liquid junction potential, use the same solvent and supporting electrolyte, as a sample and electrode internal solution.

The solvent in non-aqueous electrochemical should be considered as following :

• Electrode activity material and produced substance solubility.
• Select according to the potential area to be measured.

For example, dimethyl sulfoxide (DMSO) is major solvent in the negative potential area, and acetonitrile (ACN) is major solvent in the positive potential area.
The non-aqueous solution could contains impurities, and the impurities could cause the block reactions. Distilled the solvent sufficiently, to eliminated impurities before using.

If the sample is dissolved in an organic solvent, the supporting electrolyte must be added.
In order to select the supporting electrolyte, it is necessary to consider the following :

• Solubility in organic solvents
• Wide potential window
• No reaction with organic solvent

Typical supporting electrolyte :

• TEAP : Tetraethylammonium perchlorate
• TBAPF6 : Tetrabutylammonium hexafluorophosphate

Contents for, Non Aqueous reference electrode

1. Teflon cap with Ag wire (1 pc)
2. Sample holder dia 6mm (1 pc)

The internal solution is not included, please prepare the internal solution first. In the section Internal solution, there is an instruction for the preparation of an acetonitrile (ACN) solution containing 0.01 M silver(I) nitrate (AgNO3) and 0.1 M tetrabutylammonium perchlorate (TBAP), it can be used as a reference.​​​​​​​

1. Immerse the sample holder tip (IIPG) in an organic solvent to be used,at least for one hour.
2. Fill the sample holder with 0.6 mL of the electrolyte solution, use the pipette and fill it carefully.
3. If there is a presence of the air bubble on the extremity (liquid junction), flick the sample holder with the fingers.
4. Set the Teflon cap and seal the cap with a parafilm, to avoid the evaporation of the inner solution.
   （If the reagents will be prepared by yourself, choose a special grade reagents.)

​​​​​​​Attention for the re-assembly​​​​​​​

• There is a possibility to have the precipitation of the support salt inside of the sample holder and Teflon cap, please wash with acetonitrile before re-use.
• If the extremity tip (liquid junction IPPG) is dried, suport salt deposition will happen, blocking the holes which increases the liquid junction resistance or breaks the tip (IPPG). Keep it moistening in a solvent.
  （∗Ion Permeability Porous Glass clogging can not be recovered.）