Ion selective sensor and method of making such sensor

• US 4,242,191 A
• Filed: 05/08/1979
• Issued: 12/30/1980
• Est. Priority Date: 05/10/1978
• Status: Expired due to Term

• Current Assignee: Dr Eduard Fresenius Chemisch-Pharmazeutische Industrie KG Apparatebau KG
• Original Assignee: Dr Eduard Fresenius Chemisch-Pharmazeutische Industrie KG Apparatebau KG
• Inventors: Schal, Wilfried, Schindler, Johannes G.
• Primary Examiner(s): Kaplan, G. L.
• Application Number:
  US06/037,234
• Time in Patent Office: 602 Days
• Field of Search: 204/195 G, 204/195 M, 427/77
• US Class Current: 204/418
• CPC Class Codes: G01N 27/3335 the membrane containing at least one organic component G01N27/3271 takes precedence; aspects concerning the enzyme reagent in enzyme electrodes C12Q1/001
• CPC Class Codes: G01N 27/36 Glass electrodes

Abstract

An ion-sensitive sensor has an electron-conducting electrode and a membrane for determining the selectivity which is arranged to come into contact with a medium to be analyzed. The membrane is applied to an ion-conducting layer of glass which is in connection with the electron-conducting electrode via an ion-conductor. The membrane preferably comprises at least one organic polymer, such as PVC, having ion-active components, such as organic carrier molecules, selective ligands or ion exchangers, embedded therein. The layer of glass may also have ion-selective properties.

Claims

1. In an ion-selective sensor for use in a medium to be analyzed, including a first electrode having a housing with a chamber therein, said chamber bein terminated at one end by an ion-conducting layer of glass and a second electrode unit, the improvement comprising an ion-selective membrane for determining the selectivity of said electrode unit disposed upon said ion-conducting layer of glass.

2. A sensor according to claim 1, wherein said membrane comprises at least one organic polymer having ion-selectively active components embedded therein.

3. A sensor according to claim 1, wherein the ion-selectively active components comprise organic carrier molecules, selective ligands or ion exchangers.

4. A sensor according to claim 1, wherein the layer of glass also has ion-selective properties.

5. A sensor according to claim 1, further including a ligand ion conducting medium in said chamber.

6. A sensor according to claim 1, further including a solid ion conducting medium disposed in said chamber.

7. A sensor according to claim 1, wherein the membrane is disposed in a depression formed by said glass proximate one end of said first electrode.

8. A sensor according to claim 7, wherein the depression is formed by a guide bushing surrounding the ion-conducting layer of glass projecting beyond said layer of glass.

9. A sensor according to claim 8, wherein said guide bushing is made of a material which can be dissolved by said solvent.

10. A sensor according to claim 1, wherein the membrane material is soluble in an organic solvent.

11. A sensor according to claim 1, further including a hollow housing for receiving said sensor body, said membrane completely encasing the ion-conducting layer of glass and producing a seal with respect to said housing and said sensor.

12. A method of manufacturing an ion-selective sensor as described in claim 1, comprising the steps of:

(a) dissolving an organic polymer together with ion-active substances in a suitable solvent;

(b) applying said polymer to said ion-conducting layer of glass; and

(c) allowing said polymer to dry.

13. An ion-selective sensor comprising:

(a) a housing having two coaxial chambers, the inner coaxial chamber being terminated at one end in an ion-conducting layer of glass, said outer chamber adapted to communicate, via a porous medium, with a medium to be analyzed;

(b) an ion-selective membrane for determining the selectivity of said sensor coating said ion-conducting layer of glass; and

(c) first and second electrodes adapted to be connected to a measurement source, said first electrode being immersed into an ion-conducting medium disposed within said inner chamber, said second electrode being immersed into said medium to be analyzed disposed within said outer chamber.

14. In an ion-selective sensor for use in a medium to be analyzed, including the first electrode and a second electrode unit, said first electrode having a housing with a chamber therein, said chamber being terminated at one end by an ion-conducting layer of glass being coated by a membrane, the improvement wherein said membrane comprises ion-selectively active components for determining the selectivity of said sensor.