Potassium ion-selective compositions and electrodes...

Details Potassium ion-selective compositions and electrodes... Potassium ion-selective compositions and electrodes...

G - Physics

01

N

150/1, 324/28

G01N 27/30 (2006.01) G01N 27/333 (2006.01) G01N 33/84 (2006.01)

Patent

CA 1210674

-i- POTASSIUM ION-SELECTIVE COMPOSITIONS AND ELECTRODES CONTAINING SAME Abstract of the Disclosure Potassium ion-selective compositions which comprise valinomycin and a particular carrier solvent capable of solvating valinomycin are disclosed. The carrier solvent is a dicarboxylic acid diester having at least 25 carbon atoms, a viscosity of less than about 120 centipoise at 20°C. and a boiling point greater than about 170°C. at 5 mm pressure. A pre- ferred carrier solvent is diisodecyl phthalate. Membranes prepared from these compositions preferably have a glass transition temperature greater than about -50°C. These membranes are particularly useful in dry-operative potassium ion-selective electrodes which are capable of selectively determining potas- sium ions in preference to other ions.

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