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?


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.