What is the best way to stop counter/reference electrodes contaminating solutions?

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Alaa Y. Faid

for reference electrode , you can use salt bridge to avoid contaminations come from reference electrode

https://en.wikipedia.org/wiki/Salt_bridge

Sean Goodwin

Thanks Alaa. Though I fear that if K+ and Cl- ions can move through the salt bridge, so can (e.g.) Ag+ ions

Kyle A. Grice

What about a nafion or similar membrane? I've seen H-cells with a central clamp with a nafion membrane used before.

Thanks Kyle; we're trying out some membranes now...