Application of Polyaniline Conducting Polymer as a New Indicator Electrode for Potentiometric Titration of Halide Ions

This paper describes a potentiometric titration using a modified pencil graphite electrode with polyaniline (termed as PGE/PAniCl) for determination of halides at low concentrations (ppm). polyaniline (PAni) was first prepared by chemical polymerization of aniline in the presence of HCl. PGE/PAniCl was prepared using a pencil graphite electrode coated by a thin film of PAni/Cl via solution cast method. The PGE/PAniCl indicator electrode was successfully used for quantitative determination of halide ions by potentiometric titration. The titration curves were compared with those obtained by a commonly used silver indicator electrode and found to be more sensitive than commonly used silver indicator electrode. The electrode introduced in this article can be fabricated simply and can be used for determination of chloride ions in water samples via potentiometric titration with high accuracy.