Sensitive Method for the Oxidation-determination of Trace Hydroxylamine in Environmental Water Using Hypochlorite Followed by Gas Chromatography

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  • KATO Toshikuni
    Graduate School of Science and Engineering, Shimane University Shimane Prefectural Institute of Public Health and Environmental Science
  • SUGAHARA Shogo
    Graduate School of Science and Engineering, Shimane University
  • MURAKAMI Makoto
    Graduate School of Science and Engineering, Shimane University
  • SENGA Yukiko
    Faculty of Science, Toho University
  • EGAWA Michiko
    Graduate School of Science and Engineering, Shimane University
  • KAMIYA Hiroshi
    Shimane Prefectural Institute of Public Health and Environmental Science Estuary Research Center, Shimane University
  • OMATA Kohji
    Graduate School of Science and Engineering, Shimane University
  • SEIKE Yasushi
    Graduate School of Science and Engineering, Shimane University Estuary Research Center, Shimane University

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Abstract

We developed a method for quantifying trace NH2OH in brackish- and sea-water samples. Previously reported methods applicable to fresh water cannot be applied to such samples. We determined that interference in seawater owing to the bromide ion can be removed by the addition of phenol. In our procedure, phenol and hypochlorite solutions were added to a sample solution to oxidize NH2OH to N2O. N2O in the sample was then quantified by headspace analysis. The method is not affected by the salt content or ammonia, nitrate, or nitrite at concentrations of 300 μgN L−1 or less. It has a limit of detection of 0.2 μgN L−1, and can quantify NH2OH in natural water samples with a wide range of salinity. It was applied to samples from Lake Nakaumi, a brackish lake located in the eastern part of Shimane Prefecture, Japan.

Journal

  • Analytical Sciences

    Analytical Sciences 33 (6), 691-695, 2017

    The Japan Society for Analytical Chemistry

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