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Studying Current-Potential Curves Using Bipotentiometric Iodometric Back-Titration for the Determination of Ascorbic Acid in Fruits and Vegetables
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Abstract
A method for the determination of the ascorbic acid content in fruits and vegetables was used to introduce the principles of voltammetry. The procedure combines an iodometric back-titration with voltammetric (bipotentiometric) end point detection, which minimizes the risk of ascorbic acid oxidation, allowing for a rapid and efficient quantification of vitamin C in fruits and vegetables. A better understanding of the titration curve is achieved by analyzing the schematic current–potential curves of the anodic and cathodic half-cell reactions during the titration. Hence, not only theoretical principles of voltammetry are considered, but also the applications of these techniques to quantify a chemical species in a complex matrix. As a result, the laboratory experiment proposed is a valuable tool for analytical chemistry students to discuss electrochemistry techniques in the context of an interesting application.
Keywords (Audience):
Second-Year UndergraduateKeywords (Domain):
Analytical ChemistryKeywords (Pedagogy):
Hands-On Learning / ManipulativesKeywords (Subject):
Constitutional IsomersCiting Articles
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This article has been cited by 3 ACS Journal articles (3 most recent appear below).
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Michael J. Sanger and Matthew DannerJournal of Chemical Education2010 87 (11), 1213-1216When grocery stores sell solutions of ammonia, they are labeled “ammonia”; however, when the same solution is purchased from chemical supply stores, they are labeled “ammonium hydroxide”. The goal of this experiment is for students to determine which name ...
Measuring Vitamin C Content of Commercial Orange Juice Using a Pencil Lead Electrode
David King, Jeffrey Friend and James KariukiJournal of Chemical Education2010 87 (5), 507-509Measuring Vitamin C Content of Commercial Orange Juice Using a Pencil Lead Electrode
David King, Jeffrey Friend and James KariukiJournal of Chemical Education2010 87 (5), 507-509A pencil lead successfully served as an electrode for the determination of ascorbic acid in commercial orange juice. Cyclic voltammetry was used as an electrochemical probe to measure the current produced from the oxidation of ascorbic acid with a variety ...
Gold Electrodes Modified with Self-Assembled Monolayers for Measuring L-Ascorbic Acid: An Undergraduate Analytical Chemistry Laboratory Experiment
Takashi Ito , D. M. Neluni T. Perera and Shinobu NagasakaJournal of Chemical Education2008 85 (8), 1112Gold Electrodes Modified with Self-Assembled Monolayers for Measuring L-Ascorbic Acid: An Undergraduate Analytical Chemistry Laboratory Experiment
Takashi Ito , D. M. Neluni T. Perera and Shinobu NagasakaJournal of Chemical Education2008 85 (8), 1112This article describes an undergraduate electrochemistry laboratory experiment in which the students measure the L-ascorbic acid content of a real sample. Gold electrodes modified with self-assembled monolayers (SAMs) of thioctic acid and cysteamine are ...
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- Received: August 03, 2009
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