REFERENZELEKTRODE FUER DIE IONENAKTIVITAETSMESSUNG, INSBESONDERE FUER DIE PH-WERTMESSUNG.

摘要

Reference electrode (I) for circuit for measuring ionic activity, partic. pH measurement, comprises (a) a glass tube (22), lower end of which is closed by a plug (25) of porous ceramic, and filled with an electrolyte (24); (b) a galvanically chlorinated Ag wire (23) immersed in this electrolyte and joined to a connecting cable (3); (c) a sleeve (21) of an electrochemically neutral but electrically conducting material enclosing the glass tube. Reference electrode (II) for a measuring circuit, partic. pH measurement, has a galvanically chlorinated Ag wire or woven wire with a sleeve of a polymer (e.g., polyvinyl ester, polyethylene, polypropylene, PVC, epoxide resin) which has been mixed before hardening or polymerisation with crystalline KCl or other electrically conducting additive mixed with finely divided AgCl.