title: 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-Rauscher oscillatory reaction.
abstract: 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(-) concentrations was close to the theoretical within a few millivolts. Besides Ag(+) and I(-) 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-Rauscher reaction with the new electrode the potential crosses the "solubility limit potential" (SLP) of silver iodide. Potentials below SLP are controlled by the concentration of I(-), 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.
authors.affiliation: Department of Physical Chemistry, Babes-Bolyai University, RO-400028 Cluj-Napoca, Romania.
authors.forename: Norbert
authors.initials: N
authors.lastname: Muntean
authors.forename: Lawson Bich
authors.initials: LB
authors.lastname: Thuy
authors.forename: Kristóf
authors.initials: K
authors.lastname: Kály-Kullai
authors.forename: Maria
authors.initials: M
authors.lastname: Wittmann
authors.forename: Zoltán
authors.initials: Z
authors.lastname: Noszticzius
authors.forename: Lavinia
authors.initials: L
authors.lastname: Onel
authors.forename: Stanley D
authors.initials: SD
authors.lastname: Furrow
mesh_terms: D004566:Electrodes; D007454:Iodides / Q000737:chemistry; D017613:Iodine Compounds / Q000032:analysis* / Q000138:chemical synthesis; D012834:Silver / Q000737:chemistry; D018030:Silver Compounds / Q000737:chemistry; D012995:Solubility
chemical_list: D007454:Iodides; D017613:Iodine Compounds; D018030:Silver Compounds; C081961:hypoiodous acid; D012834:Silver; C030584:silver iodide