Nitrate‐Selective Solid Contact Electrodes with Poly(3‐octylthiophene) and Poly(aniline) as Ion‐to‐Electron Transducers Buffered with Electron‐Ion‐Exchanging Resin

The study of nitrate selective solid contact electrodes containing poly(3‐octyl)thiophene and poly(aniline) demonstrated the advantage of buffering the transducing layer with electron‐ion‐exchanging resin. The buffering, in particular in the case of poly(aniline) doped with nitrate anions ensured significant improvement of the long‐term stability and piece‐to‐piece reproducibility of the electrode potentials. It is shown that the redox species causes potential drift after a long time delay, probably because of slow diffusion in the membrane bulk.