低温下の尿素系融雪剤分解による魚毒性 Toxicity of the Decomposition Product of Urea Compound Deicer to Fish at the Low Temperature

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The fish death accident occurred in Miyagi Prefecture in the winter of 1999/2000. It was considered that urea compound deicer used on the road flowed into the stream, and microorganisms in the fluffy mud of the site decomposed urea, then the strong toxicity, which was caused by the synergism of ammonia and carbonic acid, led to the fish death.<br>We tested the possibility of decomposing urea compound deicer by the fluffy mud in the stream where accident occurred. We carried out experiments of decomposition of the urea solution using the fluffy mud samples of the accident spot of the stream at various temperatures. The experimental results showed that the fluffy mud strongly decomposed urea into ammonia and carbonic acid even at the low temperature, and one fungus was recognized in the mud : This was identified as <i>Trichosporon cutaneum</i> by the biological and chemical tests. None have reported that this fungus decomposes urea in the river, the natural water world.

収録刊行物

  • 水環境学会誌 = Journal of Japan Society on Water Environment

    水環境学会誌 = Journal of Japan Society on Water Environment 25(2), 93-96, 2002-02-10

    Japan Society on Water Environment

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各種コード

  • NII論文ID(NAID)
    10008006539
  • NII書誌ID(NCID)
    AN10372439
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09168958
  • NDL 記事登録ID
    6064092
  • NDL 雑誌分類
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学)
  • NDL 請求記号
    Z16-1045
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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