Revisiting the kinetics and mechanism of the tetrathionate-hypochlorous acid reaction in nearly neutral medium

Dénes Varga, Attila K. Horváth

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6 Citations (Scopus)

Abstract

The tetrathionate-hypochlorous acid reaction has been investigated in nearly neutral medium at I = 0.5 M ionic strength and T = 25.0 ±0.1°C in dihydrogen-phosphate-hydrogen-phosphate buffer by UV-vis spectrophotometry. In excess of hypochlorous acid, the stoichiometry was found to be S 4O62- + 7HOCl + 3H2O→ 4SO 42- + 7Cl- + 13H+, but in excess of tetrathionate colloidal sulfur precipitates. On the basis of the simultaneous evaluation of the kinetic curves, a nine-step kinetic model with four fitted and five fixed rate coefficients is proposed. Analogous oxidation reactions of tetrathionate are also compared and discussed.

Original languageEnglish
Pages (from-to)13907-13912
Number of pages6
JournalJournal of Physical Chemistry A
Volume113
Issue number50
DOIs
Publication statusPublished - Dec 17 2009

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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