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Oxidation of iron causes removal of phosphorus and arsenic from stream water in groundwater-fed lowland catchments Stijn Baken, Peter Salaets, Nele Desmet, Piet Seuntjens, Elin Vanlierde, and Erik Smolders Environ. Sci. Technol., Just Accepted Manuscript • DOI: 10.1021/es505834y • Publication Date (Web): 06 Feb 2015 Downloaded from http://pubs.acs.org on February 10, 2015
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Environmental Science & Technology
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Oxidation of iron causes removal of phosphorus and
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arsenic from stream water in groundwater-fed lowland
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catchments
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STIJN BAKEN1*, PETER SALAETS2, NELE DESMET3, PIET SEUNTJENS345, ELIN VANLIERDE6, ERIK
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SMOLDERS1
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bus 2459, 3001 Leuven, Belgium
KU Leuven, Department of Earth and Environmental Sciences, Kasteelpark Arenberg 20
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Kasteelpark Arenberg 21 box 2302, 3001 Leuven, Belgium
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2020 Antwerp, Belgium
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Belgium
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KU Leuven, Faculty of Bioscience Engineering, Expertise Unit on Educational Provision,
VITO, Boeretang 200, 2400 Mol, Belgium University of Antwerp, Department of Bioscience Engineering, Groenenborgerlaan 171,
Ghent University, Department of Soil Management, Coupure Links 653, 9000 Ghent,
Flanders Hydraulics Research, Berchemlei 115, 2140 Antwerp, Belgium
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* Corresponding author, phone +32 16 32 17 61, e-mail
[email protected] 1 ACS Paragon Plus Environment
Environmental Science & Technology
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Abstract
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The fate of iron (Fe) may affect that of phosphorus (P) and arsenic (As) in natural waters.
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This study addresses the removal of Fe, P, and As from streams in lowland catchments fed by
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reduced, Fe-rich groundwater (average: 20 mg Fe L-1). The concentrations of dissolved Fe
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(0.45 µm)
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authigenic (or diagenetic) Fe oxyhydroxides which have been characterized as ferrihydrite
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and lepidocrocite10. Such precipitates may bind other elements by adsorption or
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coprecipitation, including As, Cu, Ni, P, Pb, and Zn11–14. The coupling of reductive
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dissolution and oxidative precipitation may lead to Fe cycling, which has been observed in a
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variety of environments including sediments, groundwater seeps, and lakes15–17. Streams
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generally contain low dissolved (
