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Coulometric Titrations in Wine Samples: Studies on the Determination of S(IV) and the Formation of Adducts

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Denise Lowinsohn and Mauro Bertotti

Instituto de Química, Universidade de São Paulo, São Paulo, SP 05508-900, Brazil

J. Chem. Educ., 2002, 79 (1), p 103

DOI: 10.1021/ed079p103

Publication Date (Web): January 1, 2002

Section:

History, Education, and Documentation

Abstract

In this experiment, the sulfite in white wine samples is quantified by coulometric titration with iodine, using a procedure that minimizes errors due to air oxidation. Some aspects of the distinction of S(IV) forms in such matrices are discussed on the basis of the formation of adducts between sulfite and carbonyl compounds present in the wine. The reactivity of these S(IV)-bound compounds toward the reaction with iodine is addressed and the stability of the adducts as the sample pH is changed is discussed.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Electrochemistry

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