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Coulometric Titration of Urea with Electrogenerated Hypobromite

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Abstract

A definitive method is described for the indirect assay of several tens of milligrams of urea by coulometric titration. Urea was decomposed in concentrated sulfuric acid using a Kjeldahl flask. Subsequently, the formed ammonium ion was titrated with electrogenerated hypobromite ion in a sodium bromide-sodium tetraborate medium of pH 8.6, with amperometric end-point detection. Parameters affecting the pretreatment procedure were evaluated. The optimized conditions included the heating of 2 g of urea at around 300°C for 2 h with 10 cm3 of sulfuric acid. Under the proposed conditions, the assay value with expanded uncertainty (k = 2), 99.870 ± 0.026%, agreed well with the certified value of NIST SRM 912a urea, 99.9 ± 0.1%.

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Authors and Affiliations

  1. Faculty of Engineering, Tokyo University of Science, 1-3 Kagurazaka, 162-8601, Shinjuku, Tokyo, Japan

    Jun Kato, Takuma Koseki, Yukie Aoki, Ayako Yamada & Tatsuhiko Tanaka

  2. Nuclear Cycle Backend Directorate, Japan Atomic Energy Agency, 4-33 Muramatsu, Ibaraki 319-1195, Tokai, Naka, Japan

    Jun Kato

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  1. Jun Kato
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  2. Takuma Koseki
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  3. Yukie Aoki
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  4. Ayako Yamada
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  5. Tatsuhiko Tanaka
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Correspondence to Tatsuhiko Tanaka.

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Kato, J., Koseki, T., Aoki, Y. et al. Coulometric Titration of Urea with Electrogenerated Hypobromite. ANAL. SCI. 29, 753–755 (2013). https://doi.org/10.2116/analsci.29.753

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  • DOI: https://doi.org/10.2116/analsci.29.753

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