Chaotic pH oscillations in the sulfur(IV)-hydrogen peroxide-marble flow system

Gyula Rábai, Ichiro Hanazaki

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A self-accelerating oxidation of sulfur(IV) by hydrogen peroxide in an unbuffered aqueous solution in the presence of solid marble has been utilized to develop an oscillatory system in a continuous-flow stirred tank reactor. First, a model was constructed from the component reactions: (1) H2O2 + HSO3- → H+ + SO42- + H2O; (2) CaCO3 + H+ → Ca2+ + HCO3-; (3) HSO3- ↔ H+ + SO32-; (4) CO2(aq) + H2O ↔ H+ + HCO3-; (5) CO2(aq) → CO2(gas). Simulations based on the kinetics of reactions 1-5 predicted regular pH oscillations, bursting, and chaotic responses. Most of the simulated phenomena were found experimentally in the vicinity of the predicted conditions. The parameters of the experimental oscillations also agree well with their calculated counterparts.

Original languageEnglish
Pages (from-to)15454-15459
Number of pages6
JournalJournal of physical chemistry
Issue number38
Publication statusPublished - Sep 19 1996


ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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