Patent ID: 8137520

Claim:
A chloride ion-selective electrode, for sensing the concentration of chloride ions of a sample solution, comprising: a reference electrode, immersed in a reference solution containing chloride ions; and a chloride ion-selective membrane, as an interface of the sample solution and the reference solution, comprising; a chloride ionophore, for binding chloride ions; a chloride ion-exchange resin, for exchanging chloride ions of the sample solution and the reference solution, wherein the chloride ion-exchange resin is selected from the group consisting essentially of strong anion-exchange resin, weak anion-exchange resin, and combinations thereof, and wherein the chloride ion-exchange resin is selected from the group consisting essentially of trimethyl ethenyl quarternary ammonium chloride polystyrene-divinylbenzene resin, m-phenylenediamine-formaldehyde resin, melamine (acyl)-guanidine-formaldehyde resin, and combinations thereof; a plasticizer; and a polymer matrix.