{"datasetrec":{"DasID":1115,"Acronym":null,"StandardTitle":"Cycling of iron and manganese in freshwater, estuarine and deep sea sediments in the Scheldt and Grevelingen Lake","OrigTitle":"De cyclus van ijzer en mangaan in zoetwater, estuariene en diepzeesedimenten in de Schelde en het Grevelingenmeer","OrigTitleLangID":41,"OrigTitleLangCode":"nl","OrigTitleLang":"Dutch","OrigTitleLangNL":"Nederlands","VersionName":"Jul 2003","ContactEmail":null,"VersionDate":null,"VersionDay":null,"VersionMonth":7,"VersionYear":2003,"SizeReference":null,"EngAbstract":"The reactivity of sedimentary iron oxide is usually characterised by the size of various operationally defined iron pools. These different iron pools partly overlap, cover a large range of reactivities, and are affected by various sediment properties.","EngDescr":"We used a kinetic method (Postma 1993) in which iron oxide reactivity is represented as a reactive continuum, and compare results of a freshwater, an estuarine and a deep-sea sediment to traditional, single-step extraction results. Depth profiles were derived using both approaches. The traditional extraction methods have sufficient resolving power to reveal concentration differences of reactive iron oxides between samples from deep-sea, estuarine and freshwater sediments, but result in homogeneous depth profiles for iron oxide composition in the latter two sediments. The reactive continuum approach resulted in heterogeneous depth profiles of initial iron oxide reactivity and reactivity distribution for estuarine and freshwater sediments, thereby revealing differences in iron oxide composition. Due to low concentrations of reactive iron oxides the reactive continuum approach was not applicable in deep-sea sediments. Reactivities were independent of sediment surface area and the load of reactive iron oxides.","OrigAbstract":null,"OrigDescr":null,"Comments":null,"ReleaseDate":null,"ReleaseDate0":null,"OrigDescrLang":"Dutch","EmbargoDate":null,"OrigDescrLangNL":"Nederlands","OrigLangCode":"nl","OrigLangCodeExtended":"dut","OrigLangID":41,"DescrCompFlag":0,"DescrTransFlag":0,"Citation":"Ferro I., Soetaert K. 2002: Cycling of iron and manganese in freshwater, estuarine and deep sea sediments. Netherlands Institute of Ecology; Centre for Estuarine and Marine Ecology, Netherlands. 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