Binding characteristics and dissociation kinetics for iron(II) complexes with seawater extractable organic matter and humic substances in a compost

Hisanori Iwai; Masami Fukushima; Mitsuo Yamamoto

doi:10.2116/analsci.28.819

Binding characteristics and dissociation kinetics for iron(II) complexes with seawater extractable organic matter and humic substances in a compost

Anal Sci. 2012;28(8):819-21. doi: 10.2116/analsci.28.819.

Authors

Hisanori Iwai¹, Masami Fukushima, Mitsuo Yamamoto

Affiliation

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

PMID: 22878639
DOI: 10.2116/analsci.28.819

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.