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Journal Articles Water Research Year : 1998

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.

Dates and versions

insu-02886141 , version 1 (01-07-2020)

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Gwenaelle Olivié-Lauquet, Thierry Allard, Marc F. Benedetti, Jean-Pierre Muller. Chemical distribution of trivalent iron in riverine material from a tropical ecosystem: a quantitative EPR study. Water Research, 1998, 33 (11), pp.2726-2734. ⟨10.1016/S0043-1354(98)00479-5⟩. ⟨insu-02886141⟩
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