JOURNAL OF CHILEAN CHEMICAL SOCIETY

Vol 61 No 4 (2016): Journal of the Chilean Chemical Society
Original Research Papers

ELECTROCHEMICAL METHOD FOR SULFITE DETERMINATION IN WINES BY ELECTROCHEMICAL RESPONSE USING A MEMBRANE ABSORBER SYSTEM

Roxana Arce
Universidad de Santiago de Chile, Department of Chemical Engineering, Faculty of Engineering
Carla Báez
Universidad de Santiago de Chile, Department of Materials, Faculty of Chemistry and Biology
J. P. Muena
Pontificia Universidad Católica de Chile, Department of Inorganic Chemistry, Faculty of Chemistry
María J. Aguirre
Universidad de Santiago de Chile, Department of Materials, Faculty of Chemistry and Biology
Julio Romero
Universidad de Santiago de Chile, Department of Chemical Engineering, Faculty of Engineering
Published December 10, 2016
Keywords
  • Wines,
  • Sulfite,
  • Membrane contactor,
  • Aspiration method,
  • Ripper method,
  • Electrooxidation
  • ...More
    Less

Abstract

This research demonstrates how the sulfite content can be measured by cyclic voltammetry using a previously reported membrane absorber system, which separates efficiently sulfite present in wine. Results obtained show notably similar values to those obtained for the same wine samples using modified Monier- Williams method (aspiration method) and Ripper method. The membrane absorber system allows the release of the free SO2, and can be used to determine the sulfur dioxide present in juices and other foods that contain high concentrations of phenols, polyphenols and other structurally related compounds that act as interferers in the electrochemical oxidation of sulfite. The absorber solution allows a direct measurement without change in pH or added electrolyte, facilitating the determination of great amounts of samples from diverse wines using only one calibration curve. In this way, a system that allows the detection of sulfite and that can be used in vineyards is obtained.

Finally, the method was assessed on linearity, sensitivity, accuracy, reproducibility and repeatability, obtaining values that account for the applicability of the method.

 

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