Summary
The generation of the reduced species of phenosafranine and Neutral Red by coulometric and photolytic methods is described. The electrogeneration is done at a platinum or mercury cathode, and the photogeneration by photochemical reaction between EDTA and the dye. The redox potentials for phenosafranine and Neutral Red are very low. The reduced dyes are suitable as reductimetric titrants and have been applied in coulometric and photochemical titrations of periodate, chromium(VI), iron(III), cobalt(III) and 2,6-dichloroindophenol.
Zusammenfassung
Die Herstellung der reduzierten Formen von Phenosafranin und Neutralrot mit coulometrischen bzw. photolytischen Methoden wurde beschrieben. Ersteres erfolgt an einer Platin- oder Quecksilberkathode, letzteres durch photochemische Reaktion zwischen EDTA und dem Farbstoff. Die Redox-potentiale für Phenosafranin und für Neutralrot sind sehr niedrig. Die reduzierten Farbstoffe eignen sich als reduktometrische Titranten und wurden für coulometrische und photochemische Titrationen von Perjodat, Chrom(VI), Eisen(III), Kobalt(III) und 2,6-Dichlorindophenol verwendet.
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Pérez Ruiz, T., Martinez Lozano, C. & Tomàs, V. Titration of oxidants with the reduced species of phenosafranine and neutral red, generated by electrochemical and photochemical techniques. Mikrochim Acta 81, 83–94 (1983). https://doi.org/10.1007/BF01202683
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DOI: https://doi.org/10.1007/BF01202683