Sodium ion selective electrode and method of use
First Claim
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1. A dry-operative sodium ion-selective electrode comprising:
- (a) a dried reference electrode in contact with(b) a dried reference layer buffered to a pH of from about 4 to about 8 with a water-soluble, organic dicarboxylic acid or salt thereof, which layer is in contact with one side of(c) an ion-selective membrane composition comprising an ionophore for sodium ions, a compound capable of solvating said ionophore and a supporting matrix composed of a binder material.
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Abstract
An improved dry-operative ion-selective electrode for the determination of sodium ions in aqueous fluids includes a dried internal reference electrode, a dried reference layer and a sodium ion-selective membrane composed of a binder material. The reference layer contains a metal salt and a hydrophilic binder material, and is buffered to a pH of from about 4 to about 8 with a water-soluble, organic dicarboxylic acid. This electrode can be manufactured with significantly less waste and exhibits improved uniformity in performance.
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Citations
15 Claims
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1. A dry-operative sodium ion-selective electrode comprising:
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(a) a dried reference electrode in contact with (b) a dried reference layer buffered to a pH of from about 4 to about 8 with a water-soluble, organic dicarboxylic acid or salt thereof, which layer is in contact with one side of (c) an ion-selective membrane composition comprising an ionophore for sodium ions, a compound capable of solvating said ionophore and a supporting matrix composed of a binder material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 13, 14, 15)
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9. A dry operative sodium ion-selective electrode comprising a nonporous support having thereon;
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(a) a silver/silver halide reference electrode in contact with (b) a dried reference layer comprising the dried residue of a water-soluble organic dicarboxylic acid or salt thereof which buffers said layer at a pH of from about 4 to about 8, a sodium salt and a hydrophilic binder material, which layer is in contact with one side of (c) an ion-selective membrane composition comprising an ester of monensin, a compound capable of solvating said ester and a hydrophobic polymeric binder material. - View Dependent Claims (10, 11, 12)
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Specification