caa a22 4500 378873806 CHVBK 20180305123415.0 cr unu---uuuuu 161128e20031101xx s 000 0 eng 10.1524/zpch.217.11.1427.20485 doi (NATIONALLICENCE)gruyter-10.1524/zpch.217.11.1427.20485 Bursting Oscillations in the Revised Mechanism of the Hemin - Hydrogen Peroxide - Sulfite Oscillator [Elektronische Daten] [Ronny Straube, Stefan C. Müller, Marcus J. B. Hauser] The reaction mechanism for the hemin-mediated oxidation of sulfite by hydrogen peroxide was reinvestigated. This has become necessary due to an erroneous stoichiometric factor used during a previous numerical analysis. A simple correction of the previous model failed to reproduce the experimentally observed bursting oscillations of the pH value. Therefore, we propose an extended mechanism which includes not only the autocatalytic production of H+ and pH-dependent equilibria of hemin species, but also the decomposition of hemin in media of high H2O2 concentration. The dynamic properties of this 7-variable reaction mechanism are in good agreement with previous experimental and numerical observations. A closer analysis reveals that the pH-dependent dimerisation equilibrium of hemin provides only a minor contribution to the onset of oscillations. Therefore, this equilibrium can be neglected yielding a 6-variable version of the revised 7-variable model, while maintaining the local bifurcation structure. The revised mechanisms are considered realistic models that describe the observed dynamical features of the hemin-containing pH oscillator. © 2003 Oldenbourg Wissenschaftsverlag GmbH Thermodynamics & statistical physics nationallicence Laboratory techniques, experiments nationallicence Physical chemistry nationallicence Straube Ronny aut Müller Stefan C. aut Hauser Marcus J. B. aut Zeitschrift für Physikalische Chemie/International journal of research in physical chemistry and chemical physics Oldenbourg Wissenschaftsverlag GmbH 217/11/2003(2003-11-01), 1427-1442 0044-3336 217:11/2003<1427 2003 217 zpch https://doi.org/10.1524/zpch.217.11.1427.20485 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/zpch.217.11.1427.20485 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Straube Ronny aut NATIONALLICENCE 700 1- Müller Stefan C. aut NATIONALLICENCE 700 1- Hauser Marcus J. B. aut NATIONALLICENCE 773 0- Zeitschrift für Physikalische Chemie/International journal of research in physical chemistry and chemical physics Oldenbourg Wissenschaftsverlag GmbH 217/11/2003(2003-11-01), 1427-1442 0044-3336 217:11/2003<1427 2003 217 zpch CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter