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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
| Title: | 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 |
| Authors: | Iwai, Hisanori Browse this author | | Fukushima, Masami Browse this author →KAKEN DB | | Yamamoto, Mitsuo Browse this author |
| Keywords: | Seawater extractable organic matter | | iron | | lability | | complex | | ferrozine | | seawater | | stability constant | | binding capacity |
| Issue Date: | Jul-2013 |
| Publisher: | Japan Soc Analytical Chemistry |
| Journal Title: | Analytical Sciences |
| Volume: | 29 |
| Issue: | 7 |
| Start Page: | 723 |
| End Page: | 728 |
| Publisher DOI: | 10.2116/analsci.29.723 |
| Abstract: | A fertilizer, comprised of a mixture of steel slag and compost, was used to restore seaweed beds in barren coastal areas. Complex Fe(I) 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. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/53132 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 福嶋 正巳
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