Dear Rouz,

When you say membrane, what are you referring to? Because reference electrodes do not have selective membranes but rather a junction to allow their contact with the solution where a selective electrode is measuring. Can you explain?

Dear Ademario,

Thank you very much for your response.

While cleaning the electrode, I unfortunately lost the membrane that facilitates contact with the solution. I would like to inquire about what material or component I can use at the end of the electrode to retain the KCl solution and ensure proper contact with the electrolyte.

Your guidance on this matter would be greatly appreciated.

Dear Rouz,

The most common type of junction is syntherized glass, which is also called frit, although other kinds of materials such as Teflon can be used as frits as well.

With a frit with the correct porosity, the water is contained when the electrode is not in use. However, the ions can slowly migrate from one side to the other through the solutions that soak the syntherized glass junction on both sides. Thus, the electrical contact makes the reference electrode respond.

It is advisable to store the reference electrode in a solution with the same salt concentration as the internal solution of the reference electrode. The reference electrode and its external storage solution must be inside a tube that has some kind of protection to prevent evaporation.

I rapidly collected three references that can help you solve how to substitute the junction of your electrode, I think.

Article Avoiding Errors in Electrochemical Measurements: Effect of F...

https://www.jstage.jst.go.jp/article/analsci/advpub/0/advpub_19P235/_pdf

Article Fabrication of a 3D-Printed Porous Junction for Ag|AgCl|gel-...

I hope you can fix your problem.

Regards,

Ademario

Dear Ademario,

Thank you for your prompt and thorough response to my question. Your explanation was clear and insightful, and the references you provided will be extremely helpful.

I appreciate your time and expertise.

Best regards,

Rouz