Coulometric Titration of Urea with Electrogenerated Hypobromite

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  • KATO Jun
    Faculty of Engineering, Tokyo University of Science Nuclear Cycle Backend Directorate, Japan Atomic Energy Agency
  • KOSEKI Takuma
    Faculty of Engineering, Tokyo University of Science
  • AOKI Yukie
    Faculty of Engineering, Tokyo University of Science
  • YAMADA Ayako
    Faculty of Engineering, Tokyo University of Science
  • TANAKA Tatsuhiko
    Faculty of Engineering, Tokyo University of Science

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抄録

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%.

収録刊行物

  • Analytical Sciences

    Analytical Sciences 29 (7), 753-755, 2013

    社団法人 日本分析化学会

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