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Inhibition of Sulfite Oxidation by Phenols: Screening Antioxidant Behavior with a Clark Oxygen Sensor

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László Sipos

Erdey-Grúz Tibor Technical School of Chemistry, Debrecen, Hungary H-4024

J. Chem. Educ., 1998, 75 (12), p 1603

DOI: 10.1021/ed075p1603

Publication Date (Web): December 1, 1998

Section:

History, Education, and Documentation

Abstract

In this article I describe a simple laboratory exercise to introduce the measurement of dissolved oxygen with a Clark oxygen sensor for a sophomore-level course. The reaction of sulfite with oxygen is slowed or inhibited completely in the presence of certain phenols. This can be followed easily by the degree of oxygen decrease in solution. The experiment demonstrates the effect of antioxidants and differentiates between different kinds of phenols according to their effectiveness. Extension of the technique to structurally similar compounds is also possible.

Keywords (Domain):

Inorganic Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Oxygen

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

Mechanism and Kinetics of Sulfite Oxidation in the Presence of Ethanol
Li-Dong Wang, Yong-Liang Ma, Ji-Ming Hao and Yi Zhao
Industrial & Engineering Chemistry Research2009 48 (9), 4307-4311
- Mechanism and Kinetics of Sulfite Oxidation in the Presence of Ethanol
  Li-Dong Wang, Yong-Liang Ma, Ji-Ming Hao and Yi Zhao
  Industrial & Engineering Chemistry Research2009 48 (9), 4307-4311
  Oxidation of sulfite is an important process in flue gas desulfurization. The inhibitory effects of four inhibitors on the intrinsic oxidation of sulfite were compared, and ethanol was found to be an excellent inhibitor. The intrinsic oxidation kinetics ...
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Synergy in the Autoxidation of S(IV) Inhibited by Phenolic Compounds
Wanda Pasiuk-Bronikowska, Tadeusz Bronikowski, and Marek Ulejczyk
The Journal of Physical Chemistry A2003 107 (11), 1742-1748
- Synergy in the Autoxidation of S(IV) Inhibited by Phenolic Compounds
  Wanda Pasiuk-Bronikowska, Tadeusz Bronikowski, and Marek Ulejczyk
  The Journal of Physical Chemistry A2003 107 (11), 1742-1748
  The effects of phenol (C6H5OH), catechin [C6H4(OH)2], and gallic acid [HOOCC6H2(OH)3] on the kinetics of aqueous SO2 oxidation by molecular oxygen have been investigated for dilute systems, as pertain to the chemistry of troposphere and surface waters. In ...
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