Selective electrodes for silver based on polymeric membranes containing calix[4]arene derivatives

Silver ion-selective electrodes were prepared with polymeric membranes based on two calix4]arene derivatives functionalized by two hydroxy and two benzothiazolylthioethoxy groups. The electrodes all gave a good Nernstian response of 58?mV decade^–1 for silver in the activity range 5 × 10^–6–10^–1 M, the limits of detection reached 10^–5.8 M and exhibited high selectivity towards alkali, alkaline earth and some transition metal ions. The electrode was used as indicator electrode in titrations of Ag⁺ with Cl^– ion.