Simple and complex pH oscillations and bistability in the phenol-perturbed bromite-hydroxylamine reaction

M. Orbán, Irving R. Epstein

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The unbuffered reaction between bromite and hydroxylamine at pH 3-7 has been studied under closed and open conditions. The stoichiometry of the batch system depends on the initial concentration ratio of the reactants and on the starting pH. The reaction is strongly autocatalytic in H+. Under flow conditions the reaction exhibits bistability between two steady states but does not oscillate. If the flow system is perturbed by an input of phenol, it shows oscillatory behavior in pH, potential of a Pt electrode, and color. A qualitative explanation of the batch and oscillatory behaviors is suggested. The bromite-hydroxylamine-phenol flow system can be characterized as a large-amplitude, long-period, pH-driven oscillator.

Original languageEnglish
Pages (from-to)2930-2935
Number of pages6
JournalJournal of Physical Chemistry
Volume98
Issue number11
Publication statusPublished - 1994

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Hydroxylamine
Phenol
phenols
Phenols
oscillations
Stoichiometry
Color
Electrodes
stoichiometry
oscillators
color
electrodes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Simple and complex pH oscillations and bistability in the phenol-perturbed bromite-hydroxylamine reaction. / Orbán, M.; Epstein, Irving R.

In: Journal of Physical Chemistry, Vol. 98, No. 11, 1994, p. 2930-2935.

Research output: Contribution to journalArticle

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