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Binding Characteristics and Dissociation Kinetics for Iron(II) Complexes with Seawater Extractable Organic Matter and Humic Substances in a Compost

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Abstract

A steel-slag/compost fertilizer can be useful in supplying complex Fe(II) species to barren coastal regions. Seawater extractable organic matter (SWEOM) was examined for use as a novel chelator of Fe(II) in the compost. The dissociation kinetics for Fe(II)-SWEOM were evaluated, based on the rate of ligand-exchange with ortho-phenanthroline. The ΔH‡ for the Fe(II)-SWEOM (19 kJ mol−1) was significantly smaller than the corresponding values for Fe(II) complexes with humic substances (27 kJ mol−1), suggesting that the Fe(II)-SWEOM is kinetically less stable.

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Authors and Affiliations

  1. Laboratory of Chemical Resource, Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

    Hisanori Iwai & Masami Fukushima

  2. Graduate School of Frontier Sciences & Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, 277-8564, Japan

    Mitsuo Yamamoto

Authors
  1. Hisanori Iwai
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  2. Masami Fukushima
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  3. Mitsuo Yamamoto
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Correspondence to Masami Fukushima.

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Iwai, H., Fukushima, M. & Yamamoto, M. Binding Characteristics and Dissociation Kinetics for Iron(II) Complexes with Seawater Extractable Organic Matter and Humic Substances in a Compost. ANAL. SCI. 28, 819–821 (2012). https://doi.org/10.2116/analsci.28.819

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  • DOI: https://doi.org/10.2116/analsci.28.819

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