Claims
- 1. A potassium ion-selective composition comprising valinomycin and diisodecyl phthalate.
- 2. The composition of claim 1 comprising a surfactant.
- 3. The composition of claim 1 comprising a hydrophobic polymer binder.
- 4. A potassium ion-selective composition comprising valinomycin, diisodecyl phthalate and poly(vinyl chloride-co-vinyl acetate).
- 5. A dry-operative potassium ion-selective electrode comprising valinomycin dissolved in a dicarboxylic acid diester capable of solvating valinomycin, said diester having at least 25 carbon atoms, a viscosity of less than about 120 centipoise at 20.degree. C. and a boiling point greater than about 170.degree. C. at 5 mm pressure.
- 6. The electrode of claim 5 wherein said valinomycin and said diester are distributed within a hydrophobic polymer binder.
- 7. A dry-operative potassium ion-selective electrode comprising:
- (a) a dried internal reference element 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 physical contact with said reference element, a hydrophobic ion-selective membrane of predetermined uniform thickness in regions thereof intended for physical contact with a sample for analysis, the membrane comprising a hydrophobic polymeric binder having distributed therein valinomycin dissolved in a sebacate, phthalate or adipate capable of solvating valinomycin and having at least 25 carbon atoms, a viscosity less than about 120 centipoise at 20.degree. C. and a boiling point greater than about 170.degree. C. at 5 mm pressure.
- 8. The electrode of claim 7 wherein said membrane has a glass transition temperature greater than about -50.degree. C.
- 9. The electrode of claim 8 wherein said diester is a phthalate.
- 10. The electrode of claim 9 wherein said diester is diisodecyl phthalate.
- 11. The electrode of claim 7 wherein said membrane comprises a surfactant.
- 12. A dry operative potassium ion-selective electrode comprising:
- (a) a dried internal reference element 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 physical contact with said reference element, a hydrophobic ion-selective membrane of predetermined uniform thickness in regions thereof intended for physical contact with a sample for analysis, the membrane having a glass transition temperature of greater than about -50.degree. C. and comprising poly(vinyl chloride-co-vinyl alcohol) having distributed therein valinomycin dissolved in diisodecyl phthalate.
- 13. A potassium ion-selective composition comprising valinomycin and a carrier solvent selected from the group consisting of diisodecyl phthalate, bis(2-ethylhexyl) sebacate and diisodecyl adipate.
- 14. A dry-operative potassium ion-selective electrode comprising valinomycin dissolved in a carrier solvent selected from the group consisting of diisodecyl phthalate, bis(2-ethylhexyl) sebacate and diisodecyl adipate.
- 15. The electrode of claim 14 wherein said valinomycin and carrier solvent are distributed within a hydrophobic binder.
- 16. The electrode of claim 15 wherein said hydrophobic binder is poly(vinyl chloride-co-vinyl acetate).
Parent Case Info
The patent application is a continuation of U.S. Ser. No. 506,246 filed June 20, 1983.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4276141 |
Hawkins |
Jun 1981 |
|
4476007 |
Toner et al. |
Oct 1984 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
506246 |
Jun 1983 |
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