Flow through ion selective electrode
First Claim
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1. A method for producing a flow-through ion sensing electrode, comprising the following ordered steps:
- dissolving an ion selective material in a solvent which is a swelling agent for a plastic;
subsequently soaking in said solvent at least a portion of a plastic tube having a proximal end, a distal end, an outer wall, a first lumen, a second lumen, and an inner wall separating said first and second lumens, until said portion of said tube swells, said portion including at least part of said inner wall;
subsequently drying said tube to remove said solvent; and
subsequently filling only the first lumen of said tube with an electrolye;
said method further comprising the following non-ordered steps which may be performed in any convenient order relative to said ordered steps;
sealing said first lumen distal to at least a part of said portion of said tube and sealing said first lumen proximal to at least a part of said portion of said tube; and
inserting an electrode into the first lumen of said tube intermediate said first and second sealing means.
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Abstract
An improved flow through ion sensing electrode and a method for producing it. The electrode is formed of bilumen plastic tubing using one lumen as the sample path and the other lumen as a sensing chamber. By permeating a portion of the tubing with an ion selective material, an ion selective membrane integral with the chamber wall is produced. A preferred embodiment also incorporates a reference electrode.
140 Citations
4 Claims
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1. A method for producing a flow-through ion sensing electrode, comprising the following ordered steps:
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dissolving an ion selective material in a solvent which is a swelling agent for a plastic; subsequently soaking in said solvent at least a portion of a plastic tube having a proximal end, a distal end, an outer wall, a first lumen, a second lumen, and an inner wall separating said first and second lumens, until said portion of said tube swells, said portion including at least part of said inner wall; subsequently drying said tube to remove said solvent; and subsequently filling only the first lumen of said tube with an electrolye; said method further comprising the following non-ordered steps which may be performed in any convenient order relative to said ordered steps; sealing said first lumen distal to at least a part of said portion of said tube and sealing said first lumen proximal to at least a part of said portion of said tube; and inserting an electrode into the first lumen of said tube intermediate said first and second sealing means. - View Dependent Claims (2)
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3. A method for producing a flow through ion sensing electrode from a length of tubing having a first lumen, a second lumen, an inner wall separating said first and second lumens, an outer wall, a proximal end and a distal end, fabricated of a swellable solid plastic, comprising the steps of:
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dissolving an ion selective material in a solvent which is a swelling agent for said swellable solid plastic; soaking a portion of said plastic tubing including at least part of said inner wall in said solvent in which said ion selective material has been dissolved until said portion of said tubing swells; drying said swelled tubing until said portion has returned to its original size and said solvent is removed from said tubing; and after said drying step, inserting an electrode into said first lumen of said tubing and inserting an electrolyte only in said first lumen of said tubing in contact with said electrode. - View Dependent Claims (4)
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Specification