Ion-selective electrode
First Claim
1. A dry-operative ion-selective electrode comprising:
- (a) a dried internal reference electrode comprising the dried residue of a solution of a salt and a hydrophilic polymeric binder in a solvent for the polymer and the salt; and
(b) in contact with said reference electrode a hydrophobic ion-selective membrane of predetermined uniform thickness in regions thereof intended for contact with a sample for analysis, said membrane comprising a hydrophobic binder having distributed therein an ion carrier dissolved in a carrier solvent.
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Accused Products
Abstract
A dry-operative ion-selective electrode comprising:
(a) a dried, internal reference electrode, and
(b) in contact with the reference electrode, a hydrophobic ion-selective membrane.
The ion-selective electrode described herein requires no preconditioning prior to use in an ion-sensing operation.
The reference electrode may comprise either a metal/metal salt reference half-cell or multiple-layer redox couple reference electrode. The hydrophobic membrane includes a binder having dispersed therein a solution of an ion carrier dissolved in a suitable carrier solvent.
A preferred embodiment provides for electrodes of the type described wherein the hydrophobic membrane layer is of a predetermined, uniform thickness in regions thereof intended for contact with a sample for analysis. When necessary or desirable, the electrode includes a support. A novel technique for making measurements of ion concentration by reading electrode potential prior to equilibration of the electrode is also described.
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Citations
31 Claims
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1. A dry-operative ion-selective electrode comprising:
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(a) a dried internal reference electrode comprising the dried residue of a solution of a salt and a hydrophilic polymeric binder in a solvent for the polymer and the salt; and (b) in contact with said reference electrode a hydrophobic ion-selective membrane of predetermined uniform thickness in regions thereof intended for contact with a sample for analysis, said membrane comprising a hydrophobic binder having distributed therein an ion carrier dissolved in a carrier solvent. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30)
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7. Compounds of the following structural formulas ##STR7## wherein:
- (a) R=CH2 CON(CH2 CH2 CH3)2 ##STR8##
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11. A dry-operative ion-selective electrode comprising:
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(a) a dried internal reference electrode comprising a metal/metal salt reference electrode, said reference electrode comprising a conducting layer of a metal in contact with a layer of an insoluble salt of said metal, and a dried electrolyte layer comprising the dried residue of a water soluble salt having as an anion the anion of said metal salt layer and a hydrophilic polymeric binder in a solvent for the polymer and salt; and (b) in contact with the reference electrode a hydrophobic ion-selective membrane or predetermined uniform thickness in regions intended for contact with a sample for analysis said membrane comprising an ion carrier and a carrier solvent distributed in a binder.
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15. A dry-operative ion-selective electrode comprising:
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(a) a dried redox internal reference electrode comprising the dried residue of a redox couple, a hydrophilic binder and a solvent over an electrically conducting layer; and (b) in contact with the reference electrode a hydrophobic, ion-selective membrane of predetermined uniform thickness in a region thereof intended for contact with a sample for analysis, said membrane comprising a hydrophobic binder having distributed therein an ion carrier and a carrier solvent.
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29. A planar, dry-operative ion-selective electrode comprising:
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(a) a dried metal/metal salt internal reference electrode comprising (1) a conducting layer of a metal, (2) a layer of an insoluble salt of the metal of the conducting layer, and (3) a dried electrolyte solution layer comprising the dried residue of a solution of a salt and a hydrophilic polymeric binder in a solvent for the polymer and the salt, said layer having a thickness of from about 0.1 to about 0.5 mil and comprising a hydrophilic binder having dissolved therein from about 1.40 to about 2.5 g/m2 of a water soluble salt having as anion the anion of said metal salt layer, said conducting layer in contact with said layer of insoluble salt, and (b) in contact with said electrolyte layer a hydrophobic ion-selective membrane having a predetermined uniform thickness of less than about 5 mil and comprising at least about 0.1 g/m2 of an ion carrier dissolved in an ion carrier solvent dispersed in a binder the weight ratio of said carrier solvent to said binder ranging from about 1;
1 to about 5;
2. - View Dependent Claims (31)
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Specification