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.
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