The Kinetics of the Reaction of Sulfite and Bromate<sup>1-2</sup>

Williamson, F.S.; King, Edward L.

doi:10.1021/ja01577a016

Cited by 30 publications

(32 citation statements)

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“…6,8 This reaction provides the necessary positive feedback pathway for pH oscillations in our system because its rate increases with increasing H + concentration. 9 Note that the measured acceleration in the change of pH is the result of two factors: (i) decrease of the buffering effect of S(IV) with decreasing [S(IV)]; (ii) the acceleration of the depletion of S(IV) with increasing [H + ]. We made a few kinetic runs in the presence of different amounts of marble.…”

Section: Resultsmentioning

confidence: 99%

pH Oscillations in the Bromate−Sulfite−Marble Semibatch and Flow Systems

Rábai

Hanazaki

1996

J. Phys. Chem.

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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 SO 3 2-and HSO 3 -, the oxidation of HSO 3 -and H 2 SO 3 by BrO 3 -, and a removal of H + by the CaCO 3 in marble in the form of HCO 3 -has successfully been used to simulate the observed dynamical behavior.

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Section: Resultsmentioning

confidence: 99%

pH Oscillations in the Bromate−Sulfite−Marble Semibatch and Flow Systems

Rábai

Hanazaki

1996

J. Phys. Chem.

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“…The model is based on a simplified inorganic reaction scheme, eqs. 1–3, which may ignore certain competing reactions 22,23. Also, sulfate ion, which is a product of the reaction, exhibits a small buffering effect which is not accounted for in the model but which may affect the results.…”

Section: Discussionmentioning

confidence: 99%

“…A proposed mechanism for the RH oscillator involves three relatively slow reactions17,20,22 that are essentially irreversible in the CSTR configuration. Equations R1–R3 list these reactions, along with expressions for reaction velocities, V i , taken from the literature 17…”

Section: Theoretical Sectionmentioning

confidence: 99%

Modeling of Growth, Lactate Consumption, and Volatile Fatty Acid Production by Megasphaera elsdenii Cultivated in Minimal and Complex Media

Soto-Cruz

Favela‐Torres

Saucedo‐Castañeda

2002

Biotechnology Progress

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Use of the Pirt and Luedeking-Piret equations permits the determination of the effect of medium composition on the metabolic patterns of Megasphaera elsdenii grown in minimal and complex media with lactate as the major carbon source. To establish the significance of the parameters involved in the Pirt and Luedeking-Piret equations, a quantitative statistical criterion was proposed. In the complex medium, lactate was completely used for growth and product formation, whereas in the minimal medium a fraction of the energy obtained from lactate was used for maintenance purposes. Modeling of VFA production by the Luedeking-Piret equation showed that, independent of the type of medium, acetate and propionate are growth-associated products, while butyrate and valerate are only partially growth-associated. The growth-associated products are related to energy-yielding metabolism and the non-growth-associated products are related to the consumption of reducing equivalents.

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“…1-3, which may ignore certain competing reactions. 22,23 Also, sulfate ion, which is a product of the reaction, exhibits a small buffering effect which is not accounted for in the model but which may affect the results.…”

Section: Discussionmentioning

confidence: 99%

“…A proposed mechanism for the RH oscillator involves three relatively slow reactions 17,20,22 that are essentially irreversible in the CSTR configuration. Equations R1-R3 list these reactions, along with expressions for reaction velocities, V i , taken from the literature.…”

Section: Theoretical Section Theoretical Backgroundmentioning

confidence: 99%