pH oscillations in the bromate-sulfite-marble semibatch and flow systems

G. Rábai, Ichiro Hanazaki

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

A self-accelerating oxidation of an unbuffered aqueous sodium sulfite-hydrogen sulfite solution by sodium bromate and a selective removal of the hydrogen ion by solid marble chips from the reaction mixture have been used to construct an oscillatory system. The system exhibits large-amplitude oscillations between pH 3.5 and 7.5 at 25.0°C in a continuous-flow stirred tank reactor and in a semibatch configuration. The shape, the periodic time (from 10 min to 2 h), and the region of oscillations can be controlled by using different amounts and grade size of marble. A simple reaction scheme, consisting of the protonation equilibria of SO3 2- and HSO3 -, the oxidation of HSO3 - and H2SO3 by BrO3 -, and a removal of H+ by the CaCO3 in marble in the form of HCO3 - has successfully been used to simulate the observed dynamical behavior.

Original languageEnglish
Pages (from-to)10615-10619
Number of pages5
JournalJournal of Physical Chemistry
Volume100
Issue number25
Publication statusPublished - Jun 20 1996

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Bromates
bromates
sulfites
Marble
Sulfites
Calcium Carbonate
sodium sulfites
oscillations
oxidation
hydrogen ions
Sodium
grade
Oxidation
Hydrogen
Protonation
chips
reactors
sodium
Protons
hydrogen

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

pH oscillations in the bromate-sulfite-marble semibatch and flow systems. / Rábai, G.; Hanazaki, Ichiro.

In: Journal of Physical Chemistry, Vol. 100, No. 25, 20.06.1996, p. 10615-10619.

Research output: Contribution to journalArticle

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