Determination of labile Fe(II) species complexed with seawater extractable organic matter under seawater conditions based on the kinetics of ligand-exchange reactions with ferrozine

Hisanori Iwai, Masami Fukushima*, Mitsuo Yamamoto

*この研究の対応する著者

研究成果: Article査読

9 被引用数 (Scopus)

抄録

A fertilizer, comprised of a mixture of steel slag and compost, was used to restore seaweed beds in barren coastal areas. Complex Fe(II) species, supplied by steel slag, play a significant role in supplying Fe(II) to coastal areas and stimulating seaweed growth. Seawater extractable organic matter (SWEOM) from compost is generally assumed to serve as a chelator of Fe(II) in the fertilizer. It is considered that the bioavailability of Fe(II)-SWEOM complexes is higher in the dissociable (labile) species. In the present study, a method for determining labile species of Fe(II)-SWEOM complexes in seawater (pH 8.0, I = 0.7) was developed. The method is based on a ligand-exchange reaction between SWEOM and ferrozine (FZ). Because Fe(II) is readily oxidized to Fe(III) under normal seawater conditions, ascorbic acid was added as an antioxidant. The coloring for the Fe-FZ complex in the presence of SWEOM was retarded. This retarding can be attributed to a ligand-exchange reaction between FZ and labile Fe(II)-SWEOM complexes. Conditional binding constants for the labile Fe(II)-SWEOM complexes and binding capacities of labile sites in SWEOM to Fe(II) were evaluated for a variety of total Fe(II) concentrations. 2013

本文言語English
ページ(範囲)723-728
ページ数6
ジャーナルAnalytical Sciences
29
7
DOI
出版ステータスPublished - 2013
外部発表はい

ASJC Scopus subject areas

  • 分析化学

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