A highly selective solid-contact electrode for Ag+ based on a monoazathiacrown ether ionophore

A new solid-contact Ag+-selective electrode was prepared with 9,10,12,13,24,25-hexahydro-5H,15H,23H-dibenzo[b,q][1,7,10,13,19,4,16]-entathiadiazacyclodocosine-6,16(7H,17H)-dione as ionophore, and α,ω-dihexylsexithiophene (DH-6T) ion-to-electron transducer. The sensor exhibited a working concentration range of 10−8 to 10−3 mol/L, with a near-Nernstian slope of 55.1 ± 0.2 mV/dec and detection limit of 1.7 × 10−9 mol/L. The fabricated electrodes demonstrated excellent selectivity over the most common monovalent and divalent cations.