Development of a Chloride Ion-Selective Solid State Sensor Based on Doped Polypyrrole-Graphite-Epoxy Composite

• Published in: Electroanalysis (New York, N.Y.) Vol. 22; no. 14; pp. 1650 - 1654
• Main Authors: Álvarez-Romero, G. A., Ramírez-Silva, M. T., Galán-Vidal, C. A., Páez-Hernández, M. E., Romero-Romo, M. A.
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01-07-2010; WILEY‐VCH Verlag
• Subjects: Chloride ions; Chloride quantification; Chlorides; Composites; Optimization; Polypyrrole; Potentiometric sensor; Saline; Selectivity; Sensors; Solid state; Stabilization
• ISSN: 1040-0397; 1521-4109; 1521-4109
• DOI: 10.1002/elan.200900601

This paper reports the development and characterization of a solid state potentiometric sensor for chloride ions, based on doped polypyrrole‐graphite‐epoxy composite. The optimum mixture proportion found for polypyrrole:graphite was 60 : 40 meanwhile a 50 : 50 proportion was used for the polypyrrol+graphite:epoxy mixture. The stabilization time was approximately 16 min, while the response times varied within 2 and 23 s. The sensor displayed a sensitivity of 58 mV/decade [Cl−], and 3×10−6 M detection limit. The selectivity coefficients showed a greater selectivity to that reported for commercial‐type sensors. The statistical analysis for chlorides' determination in commercial saline serums did not show significant differences respect to data reported by the manufacturers.