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Effect of aging time on the availability of freshly precipitated ferric hydroxide to coastal marine diatoms

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Title: Effect of aging time on the availability of freshly precipitated ferric hydroxide to coastal marine diatoms
Authors: Yoshida, Masahiko Browse this author
Kuma, Kenshi2 Browse this author →KAKEN DB
Iwade, Shouei Browse this author
Isoda, Yutaka Browse this author →KAKEN DB
Takata, Hyoe Browse this author
Yamada, Masumi Browse this author
Authors(alt): 久万, 健志2
Keywords: Iron uptake
Growth rate
Ferric hydroxide
Dissolution rate
Coastal marine diatom
Chaetoceros sociale
Thalassiosira weissflogii
Issue Date: May-2006
Publisher: SPRINGER
Journal Title: MARINE BIOLOGY
Volume: 149
Issue: 2
Start Page: 379
End Page: 392
Publisher DOI: 10.1007/s00227-005-0187-y
Abstract: Cell growth and iron uptake of the coastal marine diatoms Chaetoceros sociale and Thalassiosira weissflogii were studied in the presence of short-aged amorphous ferric hydroxide (am-Fe(III)) media. These were prepared by aging for 1 day, 3 days, and 3 weeks after adding a small amount of ferric iron acidic stock solution to autoclaved filtered seawater and were experimentally measured in culture experiments at 10 degrees C for C. sociale and 20 degrees C for T. weissflogii. The order of cell yields for both species was: 1-day aged am-Fe(III) > 3-day aged am-Fe(III) >> 3-week aged am-Fe(III) media. The iron uptake rates by C. sociale during 0-1 day in 1 day and 3-day aged am-Fe(III) media were about two-thirds and one-fourths, respectively, lower than that in the direct Fe(III) input medium containing C. sociale into which an acidic Fe(III) stock solution was added directly. The longer aging time of am-Fe(III) in media results in reducing the supply of bioavailable iron in the media by the slower dissolution rate of am-Fe(III) with the longer aging time. These results suggest that the chemical and structural changes of freshly precipitated amorphous ferric hydroxide with short aging time affect their ability, such as iron solubility and dissolution rate to supply bioavailable iron for the phytoplankton growth. The chemical and structural conversion of solid iron phases with time is one of the most important processes in changing the supply of available iron to marine phytoplankton in estuarine and coastal waters and in iron fertilization experiments.
Rights: The original publication is available at www.springerlink.com
Relation: http://www.springerlink.com
Type: article (author version)
URI: http://hdl.handle.net/2115/13457
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 久万 健志

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