Measurement of Hypoiodous Acid Concentration by a Novel Type Iodide Selective Electrode and a New Method To Prepare HOI. Monitoring HOI Levels in the Briggs鈥揜auscher Oscillatory Reaction

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• 作者：Norbert Muntean ; Lawson Bich Thuy ; Krist贸f K谩ly-Kullai ; Maria Wittmann ; Zolt谩n Noszticzius ; Lavinia Onel ; Stanley D. Furrow
• 刊名：The Journal of Physical Chemistry A
• 出版年：2012
• 出版时间：June 28, 2012
• 年：2012
• 卷：116
• 期：25
• 页码：6630-6642
• 全文大小：503K
• 年卷期：v.116,no.25(June 28, 2012)
• ISSN：1520-5215

文摘

A new type of iodide selective electrode prepared by dipping a silver wire into molten silver iodide is reported. The electrode was calibrated for silver and iodide ions and the measured electromotive force for various Ag⁺ and I^{鈥?/sup> concentrations was close to the theoretical within a few millivolts. Besides Ag+ and I鈥?/sup> ions, however, the electrode also responds to hypoiodous acid. Thus, the electrode was calibrated for HOI as well, and for that purpose a new method of hypoiodous acid preparation was developed. To explain the close to Nernstian electrode response for HOI and also the effect of hydrogen ion and iodine concentration on that response, the corrosion potential theory suggested earlier by Noszticzius et al. was modified and developed further. Following oscillations in the Briggs鈥揜auscher reaction with the new electrode the potential crosses the 鈥渟olubility limit potential鈥?(SLP) of silver iodide. Potentials below SLP are controlled by the concentration of I鈥?/sup>, but potentials above SLP are corrosion potentials determined by the concentration of HOI. Finally, the measured HOI oscillations are compared with calculated ones simulated by a model by Furrow et al.}