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Indirect potentiometric determination of sulphide with an iodide-selective electrode

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Summary

An indirect potentiometric method for the determination of sulphide is based on oxidation by an ethanolic solution of iodine and the measurement of the resulting iodide with an iodide-selective electrode. The limit of determination is 0.2μg. If interferents are present the sulphide is separated by precipitation and then H2S is evolved from it, absorbed and measured. The reproducibility is about 8% (relative).

Zusammenfassung

Eine indirekte potentiometrische Methode zur Bestimmung von Sulfid beruht auf der Oxydation mit alkoholischer Jodlösung und Messung des Jodids mit einer jodid-selektiven Elektrode. Die untere Grenze der Bestimmung beträgt 0,2μg. Bei Anwesenheit störender Substanzen wird das Sulfid gefällt, filtriert, daraus Schwefelwasserstoff freigesetzt und dieser absorbiert und gemessen. Die Reproduzierbarkeit beträgt etwa 8% relativ.

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Authors and Affiliations

  1. Department of Analytical Chemistry, University of Sofia, Sofia 26, Bulgaria

    M. Novkirishka & R. Christova

Authors
  1. M. Novkirishka
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  2. R. Christova
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Novkirishka, M., Christova, R. Indirect potentiometric determination of sulphide with an iodide-selective electrode. Mikrochim Acta 69, 483–491 (1978). https://doi.org/10.1007/BF01201602

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  • DOI: https://doi.org/10.1007/BF01201602

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