US 12,320,770 B2
Interference resistant solid state reference electrode
David Simon Macedo, Blackburn South (AU); and Mikko Kalevi Vepsäläinen, Chadstone (AU)
Assigned to COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION, Australian Capital Territory (AU)
Appl. No. 17/773,367
Filed by COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION, Australian Capital Territory (AU)
PCT Filed Nov. 6, 2020, PCT No. PCT/AU2020/051213
§ 371(c)(1), (2) Date Apr. 29, 2022,
PCT Pub. No. WO2021/087572, PCT Pub. Date May 14, 2021.
Claims priority of application No. 2019904216 (AU), filed on Nov. 8, 2019.
Prior Publication US 2022/0397544 A1, Dec. 15, 2022
Int. Cl. G01N 27/30 (2006.01); G01N 27/32 (2006.01); G01N 27/333 (2006.01)
CPC G01N 27/301 (2013.01) [G01N 27/32 (2013.01); G01N 27/333 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A solid state reference electrode comprising:
a reference element in ionic communication with a composite, the composite comprising an electrically insulating water-permeable polymeric matrix loaded with a solid inorganic salt comprising a reference anion, wherein the solid inorganic salt is sufficiently soluble in water that hydration of the composite will produce a constant saturation solution concentration of the reference anion at the reference element, and wherein the reference anion is capable of participating in a desired redox half-reaction at the reference element to provide a reference potential;
an electrode surface for contacting an analyte; and
a solid ion-exchange material located between the electrode surface and the reference element, the solid ion-exchange material comprising one or more non-interfering ions,
wherein the reference element is electrically insulated from at least a portion of the solid ion-exchange material, and
wherein the solid ion-exchange material comprises an ion exchange resin or a metal salt, and is configured to immobilize one or more interfering ions, when present in solution of the analyte, by exchange with the one or more non-interfering ions.