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In the Laboratory
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Using Square Wave Voltammetry on Ultramicroelectrodes To Determine Synthetic Antioxidants in Vegetable Oils
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Claudio D. Ceballos
Departamento de Ciencias Básicas y Departamento de Tecnología Química, Facultad de Ingeniería, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina
María A. Zón and Héctor Fernández
Departamento de Química, Facultad de Ciencas Exactas, Fisico-Químicas y Naturales, Universidad Nacional de Río Cuarto, (5800)–Río Cuarto, Córdoba, Argentina
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September 2006
Vol. 83 No. 9
p. 1349
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| Abstract |
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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.
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| Supplement |
Notes for the instructor, including questions for the student and answers, are available.
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| More Information |
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Citation |
Ceballos, Claudio D.; Zón, María A.; Fernández, Héctor. J. Chem. Educ. 2006 83 1349.
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Keywords |
Analytical Chemistry; Applications of Chemistry; Electrochemistry; Food Science; Graduate Education / Research; Hands-On Learning / Manipulatives; Instrumental Methods; Laboratory Instruction; Nanotechnology; Physical Chemistry; Quantitative Analysis; Upper-Division Undergraduate
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History |
Created:
Last Updated: |
8/7/2006
8/18/2006
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 Caution! | | Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations. |
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