Kinetics and mechanism of the oxidation of sulfite by chlorine dioxide in a slightly acidic medium

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Abstract

The sulfite-chlorine dioxide reaction was studied by stopped-flow method at I = 0.5 M and at 25.0 ± 0.1 °C in a slightly acidic medium. The stoichiometry was found to be 2 SO32- + 2-ClO2 + H2O → 2SO42- + Cl- + ClO 3- + 2H+ in ClO2 excess and 6SO 32- + 2·ClO2 → S2O 62- + 4SO42- + 2Cl- in total sulfite excess ([S(IV)] = [H2SO3] + [HSO 3-] + [SO32-]). A nine-step model with four fitted kinetic parameters is suggested in which the proposed adduct SO3C1O22- plays a significant role. The pH-dependence of the kinetic traces indicates that SO32- reacts much faster with ClO2 than HSO3- does.

Original languageEnglish
Pages (from-to)4753-4758
Number of pages6
JournalJournal of Physical Chemistry A
Volume110
Issue number14
DOIs
Publication statusPublished - Apr 13 2006

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sulfites
Sulfites
dioxides
chlorine
Oxidation
oxidation
Kinetics
kinetics
Kinetic parameters
Stoichiometry
adducts
stoichiometry
chlorine dioxide

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Kinetics and mechanism of the oxidation of sulfite by chlorine dioxide in a slightly acidic medium. / Horváth, A.; Nagypál, I.

In: Journal of Physical Chemistry A, Vol. 110, No. 14, 13.04.2006, p. 4753-4758.

Research output: Contribution to journalArticle

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