A Solid-state Silver Ion Selective Electrode Based on Polyaniline/Eosin Y Nanocomposite Film

Potentiometric sensor based on commercial pencil graphite electrodes coated with polyaniline (PAni) composite with Eosin Y (EY) termed as PGE/PAni-EY have been developed for potentiometric determination of silver ion. The electrode exhibited linear response with Nernstian slope of 57.6±0.8 mV per decade within the range of 1.0×10-6 to 1.0×10-1 M with limit of detection 6.5×10-7 M silver ion. Fast and stable response time of the electrode (15 s) was obtained over the concentration range of 1.0×10-1 M to 1.0×10-4 M. This electrode was also used as indicator electrode in potentiometric titration of halide ions successfully. This study shows that the introduced electrode (PGE/PAni-EY) is highly selective toward silver ion and can be used to determine silver ions in solutions with high accuracy and precision.