Reference electrode and combined electrode
First Claim
1. A reference electrode for use with a measuring electrode for measuring ion activity in a sample solution, comprising:
- an electrode chamber for holding electrolyte and an electrode element in said electrode chamber,an outside wall of said reference electrode, providing a boundary between the electrolyte and the sample solution, wherein said outside wall comprisesa resin layer which is ionically conducting, non-porous and salt-loaded, anda barrier layer through which no electrochemical communication between the electrolyte and sample solution is possible,wherein a window is present in said barrier layer thereby allowing electrochemical communication between the electrolyte in said electrode chamber and the sample solution through the resin layer at said window; and
wherein said outside wall of said reference electrode is a polymeric material prepared by a method comprising;
vertically orientating a mold which is substantially cylindrical and closed at its bottom end;
casting a salt-containing uncured polymer into said mold;
fitting one or more sleeve(s) of barrier material onto a central cylindrical inert core;
placing said core, carrying said sleeve(s), substantially centrally into said mold, thereby displacing the salt-containing uncured polymer so that said salt-containing uncured polymer occupies a gap between said sleeve-carrying core and the internal surface of the mold;
curing the polymer whilst said mold is in a position so that its longitudinal position is substantially vertical;
removing the mold and the central cylindrical inert core;
and optionally cutting off part of the base of the cured material.
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Abstract
A reference electrode including an outside wall which acts as a boundary between electrolyte and sample solution, which outside wall includes a resin which is ionically conducting, non-porous and salt-loaded, and a barrier through which no electrochemical communication between the electrolyte and sample solution is possible. A window is present in the barrier, allowing electrochemical communication between the electrolyte and the sample solution through the resin at the window. The reference electrode can be suitable for use with a separate measuring electrode, or can be combined with a measuring electrode in a single unit electrode assembly.
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Citations
14 Claims
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1. A reference electrode for use with a measuring electrode for measuring ion activity in a sample solution, comprising:
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an electrode chamber for holding electrolyte and an electrode element in said electrode chamber, an outside wall of said reference electrode, providing a boundary between the electrolyte and the sample solution, wherein said outside wall comprises a resin layer which is ionically conducting, non-porous and salt-loaded, and a barrier layer through which no electrochemical communication between the electrolyte and sample solution is possible, wherein a window is present in said barrier layer thereby allowing electrochemical communication between the electrolyte in said electrode chamber and the sample solution through the resin layer at said window; and wherein said outside wall of said reference electrode is a polymeric material prepared by a method comprising; vertically orientating a mold which is substantially cylindrical and closed at its bottom end; casting a salt-containing uncured polymer into said mold; fitting one or more sleeve(s) of barrier material onto a central cylindrical inert core; placing said core, carrying said sleeve(s), substantially centrally into said mold, thereby displacing the salt-containing uncured polymer so that said salt-containing uncured polymer occupies a gap between said sleeve-carrying core and the internal surface of the mold; curing the polymer whilst said mold is in a position so that its longitudinal position is substantially vertical; removing the mold and the central cylindrical inert core; and optionally cutting off part of the base of the cured material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of making a polymeric material suitable for use as the outside wall of a reference electrode, comprising:
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vertically orientating a mold which is substantially cylindrical and closed at its bottom end; casting a salt-containing uncured polymer into said mold; fitting one or more sleeve(s) of barrier material onto a central cylindrical inert core; placing said core, carrying said sleeve(s), substantially centrally into said mold, thereby displacing the salt-containing uncured polymer so that said salt-containing uncured polymer occupies a gap between said sleeve-carrying core and the internal surface of the mold; curing the polymer whilst said mold is in a position so that its longitudinal position is substantially vertical; removing the mold and the central cylindrical inert core; and optionally cutting off part of the base of the cured material. - View Dependent Claims (14)
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Specification