Using Square Wave Voltammetry on Ultramicroelectrodes To Determine Synthetic Antioxidants in Vegetable Oils

• Claudio D. Ceballos ^[1] ; María A. Zón ^[1] ; Héctor Fernández ^[1]
  1. [1] Universidad Nacional de Río Cuarto

     Universidad Nacional de Río Cuarto

     Argentina

     
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 83, Nº 9, 2006, pág. 1349
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • An experiment that combines essential concepts of chemical extraction, the standard-addition method, and electroanalytical techniques is reported. The determination of a synthetic antioxidant (t-butylhydroxytoluene, BHT) added to a commercial vegetable oil sample is used to perform the laboratory experiment. BHT is extracted with a nonaqueous solvent (acetonitrile, ACN) in several successive steps. Its quantification is performed by square wave voltammetry (SWV) at a carbon fiber ultramicroelectrode (UME). The analysis is based on the standard-addition method on samples obtained from extract solutions in the 0.1 M H2SO4/ACN reaction medium. Students obtain experience in different aspects of experimental chemistry working on a real matrix. This undergraduate chemical instrumental experiment is appropriate for a course on chemical instrumentation.