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Chemical distribution of trivalent iron in riverine material from a tropical ecosystem: a quantitative EPR study

Abstract : Distribution of trivalent iron has been measured in riverine materials from a tropical hydrosystem (Nyong basin, South Cameroon, central Africa). The speciation and the respective amounts of the iron species have been determined using electron paramagnetic resonance spectroscopy on freeze-dried samples separated by ultrafiltration. Trivalent iron occurred mainly in two forms, linked to organic matter (Fe-OM) and as iron oxides. Ln the Nyong, Fe occurred mainly as oxides (82%), while in the Mengong, a minor river, it was mainly linked to organic matter (64%). This indicates that iron in suspended matter results from mechanical erosion in the main Fiver and from chemical erosion in the minor river. Moreover, the similar size distribution of Fe-OM in both rivers suggests a conservative inheritance of organics-mediated transport of iron in the hydrographical network.
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Submitted on : Wednesday, July 1, 2020 - 12:05:58 PM
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Gwenaelle Olivié-Lauquet, Thierry Allard, Marc Benedetti, Jean-Pierre Muller. Chemical distribution of trivalent iron in riverine material from a tropical ecosystem: a quantitative EPR study. Water Research, IWA Publishing, 1998, 33 (11), pp.2726-2734. ⟨10.1016/S0043-1354(98)00479-5⟩. ⟨insu-02886141⟩

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