Importance

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Abstract

A dry-operative ion-selective electrode comprising: (a) a dried, internal reference electrode, and (b) in contact with the reference electrode, a hydrophobic ion-selective membrane. The ion-selective electrode described herein requires no preconditioning prior to use in an ion-sensing operation. The reference electrode may comprise either a metal/metal salt reference half-cell or multiple-layer redox couple reference electrode. The hydrophobic membrane includes a binder having dispersed therein a solution of an ion carrier dissolved in a suitable carrier solvent. A preferred embodiment provides for electrodes of the type described wherein the hydrophobic membrane layer is of a predetermined, uniform thickness in regions thereof intended for contact with a sample for analysis. When necessary or desirable, the electrode includes a support. A novel technique for making measurements of ion concentration by reading electrode potential prior to equilibration of the electrode is also described.

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First Claim