Summary
Conditions have been established for the quantitative electrochemical generation of iodine in methanol in the presence of potassium acetate. The conditional redox potentials of the iodine/iodide system in the same supporting electrolyte have been determined. With increasing concentration of potassium acetate in the solutions, the conditional redox potentials of the iodine/iodide couple were only negligibly decreased. In the presence of sodium perchlorate the redox potentials were noticeably increased. Anodically generated iodine has been applied to coulometric titration of thiols and hydrazines. The error of the determinations did not exceed ±2%.
Zusammenfassung
Die Bedingungen zur quantitativen elektrochemischen Erzeugung von Jod in Methanol in Anwesenheit von Kaliumacetat wurden untersucht. Das formale Redoxpotential des Systems Jod-Jodid wurde in der selben Grundlösung bestimmt. Durch Erhöhung der Konzentration des Kaliumacetats in der Lösung kommt es zu einer geringen Verminderung des Formalpotentials des Redoxpaares. In Anwesenheit von Natriumperchlorat sind die gefundenen Werte für das Redoxpotential bedeutend höher. Mit anodisch erzeugtem Jod wurden Thiole und Hydrazine bestimmt. Die erhaltene Fehlergrenze überschritt nicht ±2%.
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Pastor, T.J., Vajgand, V.J. & Antonijević, V.V. Coulometric determination of thiols and hydrazines with electrogenerated iodine in methanol in the presence of potassium acetate. Mikrochim Acta 81, 203–211 (1983). https://doi.org/10.1007/BF01497611
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DOI: https://doi.org/10.1007/BF01497611