PMID: 16509332Mar 3, 2006Paper

Superoxide-mediated dissolution of amorphous ferric oxyhydroxide in seawater

Environmental Science & Technology
Manabu FujiiTatsuo Omura

Abstract

We have investigated the kinetics of superoxide-mediated dissolution of amorphous ferric oxyhydroxide (AFO) in seawater by spectrophotometrically examining the rate of formation of a ferrous-ferrozine complex (Fe(II)(FZ)3) with particular attention given to the effect of aging and iron concentration on the rate of superoxide-mediated dissolution of AFO. The production rates of Fe(II)(FZ)3 decreased with aging of AFO for iron concentrations from 50 to 500 nM, indicating that changes to the chemical and physical properties of AFO affected the reactivity of inorganic ferric iron species with superoxide. A kinetic model developed by assuming that Fe(II)' formation is preceded by the thermal dissolution of AFO provided a good description of the Fe(II)(FZ)3 production rates over time. First-order rate constants for Fe(II)' formation were found to depend on the total iron concentration, suggesting that superoxide-mediated Fe(II) reduction is affected not only by the rate of thermal dissolution of AFO but also by the rate of AFO precipitation. The reported high rates of superoxide production by both photochemical and biotic pathways in aquatic systems coupled with the ability of superoxide to dissolve freshly formed ferric oxides sugge...Continue Reading

References

Jan 14, 2003·Environmental Science & Technology·Kellyn Betts
Dec 1, 1983·Environmental Science & Technology·S A CrosbyG E Millward

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Citations

Aug 7, 2013·Environmental Science & Technology·Kathrin WuttigPeter L Croot
Apr 3, 2010·Proceedings of the National Academy of Sciences of the United States of America·Gayan RubasinghegeVicki H Grassian
Nov 2, 2016·Environmental Science & Technology·Lijuan YinWeihua Song
Jan 22, 2011·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·R G ZeppB Sulzberger
Jun 4, 2020·Environmental Science and Pollution Research International·Mengyu ZhuChengzhu Zhu
Mar 9, 2007·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·R G ZeppB Sulzberger
Dec 31, 2009·Environmental Science & Technology·Maija I Heller, Peter L Croot
Jun 19, 2021·Chemical Reviews·Jianzhi HuangHuichun Zhang
Oct 15, 2014·Environmental Science & Technology·Danning ZhangWeihua Song
Oct 23, 2019·Environmental Science & Technology·Guowei XingT David Waite
Apr 19, 2007·Environmental Science & Technology·Luis M Laglera, Constant M G van den Berg

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