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Iron and manganese: reactivity and recycling Boust, D.; Fischer, J.-C.; Ouddane, B.; Petit, F.; Wartel, M. (2006). Iron and manganese: reactivity and recycling. Seine-Aval scientific programme, 9. Éditions Quae/GIP Seine-Aval/IFREMER: Plouzané. 39 pp. Deel van: Seine-Aval scientific programme. GIP Seine-Aval: Rouen, meer

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Trefwoorden

Chemical elements > Metals > Transition elements > Heavy metals > Iron Chemical elements > Metals > Transition elements > Heavy metals > Manganese Cycles > Chemical cycles Layers > Water column Sediments Toxicants Trace elements > Trace metals ANE, France, Seine Estuary [Marine Regions] Marien/Kust; Brak water

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Auteurs		Top
Boust, D. Fischer, J.-C. Ouddane, B.	Petit, F. Wartel, M.

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Abstract

The study focuses on the origin and fate of iron and manganese present in the Seine and its estuary. Reactivity and recycling were investigated. These two metals, considered to be non polluting, were selected because they can play a role as markers for processes involving highly toxic metals. The behaviour of iron and manganese was studied in the water column, suspended particles and sediments. The significance of heterogeneous exchange reactions (suspended particles - water column, sediment - interstitial water) in these metals' transport and recycling was highlighted. Manganese's behaviour in the water column was modelled using thermodynamic computation. Special focus was given to the study of early sediment diagenesis, emphasizing the vital role played by the iron carrying phases (sulphurs, carbonates) in the fate of toxic metals in the Seine estuary. Sediment not only acts as a trap for heavy metals, but can be a potential source of metal contaminants linked to physical and chemical variations of the environment. These results must be taken into account in impact studies for developments (redistribution of sediments, dredging, etc.).

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