フルボ酸第二鉄錯体とシデロフォアDesferrioxamine Bのリガンド交換速度論に及ぼす二価金属イオンの影響

  • 伊藤 紘晃
    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
  • 藤井 学
    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
  • 真砂 佳史
    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
  • 大村 達夫
    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

書誌事項

タイトル別名
  • Effect of Divalent Cations on Ligand-Exchange Kinetics of Fe (III) -Fulvic Acid Complex and Siderophore Desferrioxamine B

抄録

The effect of divalent cations (Me: Ca2+ and Mg2+) on the ligand-exchange kinetics of Fe (III) -fulvic acid complex and desferrioxamine B (DFOB) was examined by spectrophotometrically measuring the rate of Fe (III) -DFOB complex formation at the various concentrations of Me found in natural water (0-50 mM) . A kinetic model for ligand-exchange incorporating the effects of Me was also developed. The model includes the following two pathways: (1) a disjunctive pathway where Fe (III) -fulvic acid complex initially dissociates followed by complexation of free Fe (III) by DFOB; and (2) an adjunctive pathway where DFOB directly associates with the Fe (III) -fulvic acid complex followed by dissociation of the ternary complex (DFOB-Fe (III) -fulvic acid) to form Fe (III) -DFOB. The ligand-exchange rates of both pathways were accelerated in the presence of Me. The enhanced rates were well explained by considering the ternary complex formation of Me and Fe (III) -fulvic acid complex.

収録刊行物

  • 水環境学会誌

    水環境学会誌 33 (9), 131-139, 2010

    公益社団法人 日本水環境学会

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