A new solid-state silver ion-selective electrode based on a novel tweezer-type calixarene derivative

A new silver solid-state ion-selective electrode has been prepared by directly coating the surface of a glassy carbon electrode with tetrahydrofuran solution containing PVC, 25,27-dihydroxy- 26,28-bis[5-(4-methyl-6-hydroxypurimidine)thiaamyloxy] calix[4]arene, dioctyl phthalate and sodium tetraphenyl borate. The response of the electrode was linear with a good Nernstian slope of 61.4 mV decade−1 over an Ag+ ion concentration range of 5 × 10−8–1 × 10−1 mol dm−3 and a detection limit of 1 × 10−8 mol dm−3. The response time to achieve a 95% steady potential for Ag+ concentrations ranging from 1 × 10−1 to 1 × 10−6 mol dm−3 was between 5 and 10 s, and the electrode is suitable for use within the pH range of 3–7. The selectivity relative to several alkali, alkaline earth, transition and heavy metal ions was good. The electrode could be used for at least one month without a considerable alteration in its potential.