Can Ag/AgCl reference electrode be safely used in highly acidic or base medium and also in any type of solution (like non aquas, molten etc.)?
You probably need to ask the supplier of the reference probe. There are many physical forms of them, all usable in different solutions (types of frits, glass/plastic/protected, overall size...).
It is not recommended to use Ag/AgCl reference electrode with solutions of S2-, I-, and Br- species. Indeed, at the contact of Ag, these species precipitate to form a passivative layer and it leads to misread of values. Likewise, if you use Ag/AgCl reference electrode in solution containing Ag+ species, you can observe the precipitation of AgCl on the glass frit. To avoid this phenomenon, you can add a glass extension at your Ag/AgCl electrode, filled with a solution of KNO3 to maintain the electrical conduction of your system without a direct contact between Cl- and Ag+ ions. Finally, you have to take a lot of precautions when your work with alkaline solutions such as NaOH or KOH: it can lead to the corrosion of the glass frit and damaged the electrode reference.
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