Abstract A univalent cation-selective electrode has an open ended nonion-selective tube, an ion-selective disc sealed to one open end of the tube, the disc consisting of partially cured silicone rubber containing concentrated ammonium hydroxide, or partially cured, silica-filled silicone rubber containing concentrated ammonium hydroxide, a reference electrode such as a silver wire with a silver chloride portion positioned within the tube, a reference electrolyte such as a metallic chloride solution within the tube and in contact with the silver chloride portion of the silver wire, a closure over the opposite end of the tube with an aperture therein, and a portion of the silver wire extending through the aperture in the closure to the exterior of the tube.
A univalent cation-selective electrode as in claim 1, in which the partially cured silicone rubber containing ammonium hydroxide is filled with silica.
Claim 2
Dependent Claim
50 words
A univalent cation-selective electrode as in claim 2, in which the tube is non-ion-selective glass, the reference electrolyte solution is potassium chloride, and the partially cured silicone rubber containing ammonium hydroxide is filled with silica in a ratio of 100 parts of silicone rubber to 44 parts silica by weight.
Claim 3
Dependent Claim
15 words
A univalent cation-selective electrode as in claim 1, in which the tube is non-ion-selective glass.
Claim 4
Dependent Claim
16 words
A univalent cation-selective electrode as in claim 1, in which the tube is a polymethylmethacrylate polymer.
Claim 5
Dependent Claim
32 words
A univalent cation-selective electrode as in claim 1, in which the reference electrode is a silver wire with a silver chloride portion, and the reference electrolyte solution is a metallic chloride solution.