Analytical and Bioanalytical Chemistry

, Volume 382, Issue 2, pp 471–476

Simultaneous determination of phenolic compounds by means of an automated voltammetric “electronic tongue”

  • A. Gutés
  • A. B. Ibáñez
  • F. Céspedes
  • Salvador Alegret
  • M. del Valle
Special Issue Paper

DOI: 10.1007/s00216-005-3201-9

Cite this article as:
Gutés, A., Ibáñez, A.B., Céspedes, F. et al. Anal Bioanal Chem (2005) 382: 471. doi:10.1007/s00216-005-3201-9

Abstract

This contribution describes the simultaneous determination of three phenolic compounds, o-cresol, p-chlorophenol and 4-chloro-3-methylphenol, using direct oxidation and amperometric detection coupled by signal deconvolution, accomplished via chemometric methods. Direct oxidation of phenolic compounds is performed at the surface of an epoxy-graphite transducer, by linear scan voltammetry. Due to strong signal overlapping, artificial neural networks (ANNs) were used during data treatment, in a combination of chemometrics and electrochemical sensors known as an “electronic tongue”. To calibrate this system properly, a total of 80 mixed samples were prepared automatically by employing a sequential injection analysis (SIA) system designed to automatically generate the information needed to train the network. The phenolic compound concentration varied from 1 to 70 μM for o-cresol, from 0.5 μM to 140 μM for p-chlorophenol and from 1 μM to 100 μM for 4-chloro-3-methylphenol. A good prediction capability was obtained, with correlation coefficients >0.964 when the obtained values were compared with those expected for a set of 24 external test samples not used for training. The results presented here indicate that this technique is a simple and robust analytical method of environmental interest.

Keywords

PhenolsVoltammetryArtificial neural networks“Electronic tongue”

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • A. Gutés
    • 1
  • A. B. Ibáñez
    • 2
  • F. Céspedes
    • 2
  • Salvador Alegret
    • 1
  • M. del Valle
    • 1
  1. 1.Grup de Sensors i BiosensorsUniversitat Autònoma de BarcelonaBellaterraSpain
  2. 2.Grup de Sensors i Biosensors, Escola Universitària Politècnica del Medi AmbientUniversitat Autònoma de BarcelonaMollet del VallèsSpain