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Abstract

A reference electrode, optionally in combination with a measuring electrode to form a combination electrode, is disclosed in which the salt bridge comprises anionic and cationic ion exchange polymer. This polymer may be a diaphragm forming the liquid junction structure of the reference electrode. Polymer is preferably a mixture of anionic and cationic ion exchange polymer which may be either water insoluble or water soluble and is preferably converted to a form which binds equitransferent ions. When the polymer is substantially insoluble, a water-soluble thickener polymer may be incorporated in the polymer composition. Methods of measuring pH using the electrodes of the invention are also disclosed, particularly in high purity deionized water.

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First Claim