Behavior of Nitrate-Nitrogen and Nitrite-Nitrogen in Drinking Water

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Author(s)

    • SATO YOKO
    • Division of Biomedical Engineering, Research Institute, National Defense Medical College
    • ISHIHARA MASAYUKI
    • Division of Biomedical Engineering, Research Institute, National Defense Medical College
    • FUKUDA KOICHI
    • Division of Biomedical Engineering, Research Institute, National Defense Medical College
    • NAKAMURA SHINGO
    • Division of Biomedical Engineering, Research Institute, National Defense Medical College
    • MURAKAMI KAORU
    • Department of Oral and Maxillofacial Surgery, National Defense Medical College
    • FUJITA MASANORI
    • Division of Environmental Medicine, Research Institute, National Defense Medical College
    • YOKOE HIDETAKA
    • Department of Oral and Maxillofacial Surgery, National Defense Medical College

Abstract

<p>Nitrate-nitrogen (NO<sub>3</sub>-N) and nitrite-nitrogen (NO<sub>2</sub>-N) are constituents of the nitrogen cycle. NO<sub>3</sub>-N is toxic to humans, primarily due to its reduction to NO<sub>2</sub>-N. In Japan, NO<sub>3</sub>-N and NO<sub>2</sub>-N levels in tap water must not exceed 10 mg/L and only NO<sub>2</sub>-N alone not 0.04 mg/L, respectively. In this study, we verified the effect of microorganisms and ultraviolet (UV) to increase of NO<sub>2</sub>-N in water. First, all tested drinking-waters including tap water and commercial mineral water in PET bottles had < 2 mg/L NO<sub>3</sub>-N and undetectable levels (< 0.01 mg/L) of NO<sub>2</sub>-N. However, we found that NO<sub>2</sub>-N was generated in tap water left to stand at room temperature for several days, leading to increases in CF and TC counts and reduction of NO<sub>3</sub>-N. We also demonstrated that direct UV and sunlight irradiation of NO<sub>3</sub>-N-containing drinking water generated NO<sub>2</sub>-N in 1-2 h, with NO<sub>2</sub>-N reaching > 0.04 mg/mL by 4-6 h. On the other hand, NO<sub>3</sub>-N and NO<sub>2</sub>-N were undetectable in commercially purified water.</p>

Journal

  • Biocontrol Science

    Biocontrol Science 23(3), 139-143, 2018

    The Society for Antibacterial and Antifungal Agents, Japan

Codes

  • NII Article ID (NAID)
    130007485548
  • Text Lang
    ENG
  • ISSN
    1342-4815
  • Data Source
    J-STAGE 
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