La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Temporal behavior of manganese and iron in a sandy coastal sediment exposed to water column anoxia
Auteurs :	E. Kristensen, Auteur ; K. D. Kristiansen, Auteur ; M. H. Jensen, Auteur
Type de document :	Article
Dans :	Estuaries (26(3) JUN 2003)
Article en page(s) :	690-699
Résumé :	The influence of bottom water anoxia on manganese (Mn), iron (Fe), and sulfur (S) biogeochemistry was examined in defaunated sandy sediment from Kaerby Fed, Denmark, under controlled laboratory incubations. The initial narrow peaks and steep gradients in solid Mn(IV) and Fe(III) as well as porewater Mn(2+) and Fe(2+) observed in the upper 2-5 cm of the sediment indicate rapid metal reduction-oxidation cycles under oxic conditions in the overlying water. The Fe zones were generally displaced about 0.5 cut downward compared with the Mn zones due to differences in reactivity. Mn(IV) was reduced and gradually disappeared first (within

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