Akinori Jyo

Potassium ion-selective membrane electrodes based on naphtho-15-crown-5

Abstract The potassium-selective PVC membrane electrodes based on naphtho-15-crown-5 have rapid, stable and Nernstian response in the range 10 -1 –10 -5 M. The selectivity coefficient for potassium over sodium is 4 × 10 -4 .

Trifluoroacetate ion-selective electrode

Abstract The trifluoroacetate ion-selective electrode was prepared by using the organic solvent solution of trifluoroacetate salt of crystal violet or tris(bathophenanthroline) iron(II) chelate. The response is linear over the activity range 10 −1 to 3 × 10 −5 M , with a Nernstian slope 60 mV/activity decade at 29 °C. The interferences of divalent ions, chloride, fluoride and acetate ions are extremely low. Iodide interferes greatly.