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I have been using a $\ce{Ag/AgCl}$ electrode with a porous teflon tip to measure open circuit potential between two electrodes separated by a membrane. I am worried that reagents such as iron chloride and ferri/ferrocyanide have contaminated the teflon tip because we have not been using a salt bridge.

However, when I place two reference electrodes in the same solution, the difference in potential between them is very low, ~2 mV.

What effect could having reagents in the teflon tip have on my measurements?

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