Journal
ELECTROANALYSIS
Volume 18, Issue 13-14, Pages 1322-1328Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.200603532
Keywords
ion-selective electrodes; nitrate; solvent-polymeric membranes; solid contact; poly(aniline); poly(3-octylthiophene); electron-ion-exchanging resin
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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.
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