Integrated ion selection electrode device

• US 4,250,010 A
• Filed: 10/24/1979
• Issued: 02/10/1981
• Est. Priority Date: 10/27/1978
• Status: Expired due to Term

• Current Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Kitajima, Masao, Kondo, Asaji, Hatanaka, Isamu
• Primary Examiner(s): Kaplan, G. L.
• Application Number:
  US06/087,855
• Time in Patent Office: 475 Days
• Field of Search: 204/195 M, 204/195 R, 204/195 B, 128/635
• US Class Current: 204/412
• CPC Class Codes: G01N 27/28 Electrolytic cell components

Abstract

An ion selection electrode device for measuring concentrations of predetermined ions such as in biological samples in which measuring electrodes are disposed on a planar substrate with their active heads lying within a circle of small radius. A small sample of a liquid to be measured is dropped on and spreads over the circle contacting each electrode. In a preferred embodiment, two sets of electrodes are provided around adjacent circles on a single substrate, one for the sample and the other for a standard reference fluid. A dam separates the two liquids but electrical contact therebetween is provided by a porous bridge.

Claims

1. An ion selection electrode device comprising:

a supporting board having an electrically insulating surface;

a plurality of pairs of electrodes, each of said pairs being arranged on said supporting board, a first electrode of each of said pairs of electrodes having a head thereof positioned within a first circle and a second electrode of each of said pairs of electrodes having a head thereof positioned within a second circle, each of said electrodes comprising, in order, a metal substrate laminated with a layer of a non-water-soluble salt of said metal, an electrolytic layer containing anions in common with said non-water-soluble salt, and an ion selection membrane, each electrode of said pairs of electrodes having a like ion selection membrane and the ion selection membranes being different between at least some of said pairs of electrodes;

a non-water-permeable and electrically insulating membrane covering each of said electrodes with only said ion selection membranes exposed;

an insulating ridge positioned between said two circles; and

a bridge of porous material extending over said ridge.

2. The ion selection electrode device of claim 1 wherein the radius of each of said circles is no greater than 2 cm.

3. The ion selection electrode device of either claim 1 or 2 further comprising:

electrical connection means coupled to each of said electrodes; and

two switch means, a first one of said switch means being coupled to said first electrodes of said pairs of electrodes and a second one of said switch means being coupled to said second electrodes of said pairs of electrodes, said two switches coupling a selected pair of electrodes to external utilization means, said switches operating in parallel with one another.