Synthetic inorganic ion-exchange materials. Part XXXII. Studies on an araldite-based membrane of crystalline antimonic(V) acid as a nitrate ion-selective electrode

Abstract

An Araldite-based membrane of crystalline antimonic(V) acid, when acting as a nitrate ion-selective electrode, shows a near-Nernstian response for concentrations of nitrate ions between 10^–5 and 10^–1M and can be used for determining the activity of the ions. Stable potentials are observed within 10–30 s and for about 2 min. The useful pH range is 3.5–11 at a higher concentration (5 × 10^–3M) and 4.5–9 at a lower concentration (5 × 10^–4M) of nitrate ions. This membrane responds to nitrate ions in a solution containing 25% of nonaqueous solvent.