Ion-selective electrode and procedure for manufacturing same

Abstract

The invention concerns an ion-selective electrode comprising a polymer membrane, and its manufacturing procedure. Selectivity of the electrode to a given ion has been achieved in that the membrane is of material polymerized from a substance or mixture of substances containing the ion in question and from which after the polymerizing step a quantity of ions of this kind has been removed so that gaps of equivalent size have been produced in the material. An example of said polymerizable substances is a mixture formed by allyloxy-substituted propyleneglycol phosphate and calciumbisdiallyl phosphate, which is used in making a calcium-selective electrode. If in the example mixture calcium is replaced by another ion, an electrode which is sensitive to this particular ion is similarly obtained. It is to advantage in view of the electrode's mechanical properties to make the electrode without internal solution by affixing the polymer membrane directly on the surface of a semiconductor body consisting e.g. of stannic dioxide.

Dependencies are inferred from the claim text.