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Comparison of three electrochemical end-point detection methods to assay potassium dichromate by coulometric titration

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Abstract

Coulometric titrations with three electrochemical end-point detection methods were performed to assay potassium dichromate as a standard for oxidation–reduction titration. The assay as an oxidizing agent was carried out with ferrous ions produced by electrolytically reducing ferric ions. Three end-point detection methods were employed and compared with each other: constant potential amperometry, potentiometry, and constant voltage biamperometry (a dead-stop method). The last one was found to provide high accuracy in the coulometric titration of potassium dichromate. Solution form samples were also measured to confirm the possible existence of chromium(III) in potassium dichromate by both coulometric titration and ion-exchange chromatography with inductively coupled plasma time-of-flight mass spectrometry.

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Acknowledgments

The authors thank Dr. M. Ohata (National Metrology Institute of Japan) for his support to obtain some of ICP-TOFMS spectra.

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Authors and Affiliations

  1. National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 3, 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8563, Japan

    Toshiaki Asakai & Akiharu Hioki

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  1. Toshiaki Asakai
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  2. Akiharu Hioki
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Correspondence to Toshiaki Asakai.

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Asakai, T., Hioki, A. Comparison of three electrochemical end-point detection methods to assay potassium dichromate by coulometric titration. Accred Qual Assur 17, 45–52 (2012). https://doi.org/10.1007/s00769-011-0834-6

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  • DOI: https://doi.org/10.1007/s00769-011-0834-6

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