Oscillations in the Concentration of Fluoride Ions Induced by a pH Oscillator

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• 作者：Viktor Horvá ; th ; Krisztina Kurin-Csö ; rgei ; Irving R. Epstein ; Mikl&oacute ; s Orbá ; n
• 刊名：Journal of Physical Chemistry A
• 出版年：2008
• 出版时间：May 8, 2008
• 年：2008
• 卷：112
• 期：18
• 页码：4271 - 4276
• 全文大小：232K
• 年卷期：v.112,no.18(May 8, 2008)
• ISSN：1520-5215

文摘

Sustained oscillations in the concentration of free fluoride ions can be generated when the BrO₃^--SO₃^2--Mn(II) oscillator is coupled either to Al³⁺-F^- complex formation or to the Ca²⁺-F^- precipitation process ina flow reactor. By careful analysis of the relevant equilibria and optimization of the reactant concentrations,one can obtain [F^-] oscillations of several orders of magnitude as measured with an ion-selective electrode.The BrO₃^--SO₃^2--Mn(II)-Al(NO₃)₃-NaF system also exhibits bistability, that is, simultaneously stablesteady states of high and low [F^-].