Chemical distribution of trivalent iron in riverine material from a tropical ecosystem : A quantitative EPR study
Distribution of trivalent iron has been measured in riverine materials from a tropical hydro-system (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 sam...
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Published in | Water research (Oxford) Vol. 33; no. 11; pp. 2726 - 2734 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Oxford
Elsevier Science
01.08.1999
IWA Publishing/Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Distribution of trivalent iron has been measured in riverine materials from a tropical hydro-system (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. In 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 river 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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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 0043-1354 1879-2448 |
DOI: | 10.1016/S0043-1354(98)00479-5 |