沿岸域でのスーパーオキシドを介した有機鉄からのFe(II)生成機構 : クエン酸鉄錯体を用いて構築したFe(II)生成速度論モデル Mechanism of Superoxide-Mediated Fe(II) Production from Organically Complexed Fe(III) in Coastal Seawater : Kinetic Model of Fe(II) Production Developed Using Fe(III)-Citrate Complex

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著者

    • 藤井 学 FUJII Manabu
    • 東北大学大学院工学研究科土木工学専攻環境水質工学分野 Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University
    • 淵上 洋輔 FUCHIGAMI Yosuke
    • 東北大学大学院工学研究科土木工学専攻環境水質工学分野 Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University
    • 伊藤 紘晃 [他] ITO Hiroaki
    • 東北大学大学院工学研究科土木工学専攻環境水質工学分野 Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University
    • WAITE T. David
    • ニューサウスウェールズ大学土木環境工学科 School of Civil and Environmental Engineering, The University of New South Wales
    • 大村 達夫 OMURA Tatsuo
    • 東北大学大学院工学研究科土木工学専攻環境水質工学分野 Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University

抄録

Superoxide radical produced during algal metabolism is one of the most important agents that contribute to the transformation of the Fe(III)-organic ligand complex to more bioavailable Fe(II). In this work, we investigated the kinetics of superoxide-mediated Fe(II) production from Fe(III) complexed by citrate (Fe(III)Cit) in coastal seawater on the basis of a laboratory experiment and a kinetic model. To simulate a coastal environment, Fe(III)Cit samples with various ratios of citrate concentration to iron concentration (ligand/Fe ratio) were incubated for five minutes to one week in seawater medium. Then, Fe(II) production rate was spectrophotometrically measured by detecting the ferrous-ferrozine complex. During the measurement, superoxide was constantly generated by oxidizing xanthine. Fe(II) production rate generally decreased with incubation time, since Fe(III)Cit as a source of Fe(II) gradually dissociated to form less reactive iron oxyhydroxide in coastal seawater. However, when the ligand/Fe ratio was sufficiently high, the dissociation of Fe(III)Cit was suppressed and Fe(II) was formed at a relatively higher rate over one week. These results demonstrated that Fe(II) production rate is largely influenced by ligand/Fe ratio and incubation time. The kinetic model developed was in good agreement with the experimentally determined Fe(II) production rates.

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 31(2), 101-108, 2008-02-10 

    日本水環境学会

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各種コード

  • NII論文ID(NAID)
    10021158256
  • 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
    9376605
  • 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  IR  J-STAGE 
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