Biogeochemical reactivity of Fe-organic matter coprecipitates

Description: Das Projekt "Biogeochemical reactivity of Fe-organic matter coprecipitates" wird vom Umweltbundesamt gefördert und von Leibniz Universität Hannover, Institut für Bodenkunde durchgeführt. Iron(III) (hydr)oxide-organic associations in soils have been recognized to play an important role in the biogeochemical cycling of iron, carbon, and of nutrients like phosphate. In temporarily moist or water-logged soils such associations can form via the coprecipitation of dissolved organic matter (OM) with Fe(III) (hydr)oxides (FHOs). At present, it is generally unknown which factors control the formation and composition of Fe(III)-OM coprecipitates and how the structural properties translate into the cycling of the FHO and OM component involved. The objectives of the project are thus to elucidate (i) the structural properties of Fe(III)- OM coprecipitates under different environmental conditions, (ii) the subsequent stability of Fe(III)-OM coprecipitates against dissolution under both oxic as well as anoxic conditions, (iii) the changes in Fe(III)-OM coprecipitate composition upon redox oscillations, and (iii) their cumulative effects on oxyanion sorption. To achieve these goals, various batch experiments will be conducted. By using multiple analytical tools, this project will gain a fundamental understanding of the abiotic and biotic controls on the formation, structure, and biogeochemical reactivity of Fe(III)-OM coprecipitates in acidic and neutral temporarily moist soils and soils subject to redox oscillations.

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Origin: /Bund/UBA/UFORDAT

Tags: Eisen ? Biogeochemie ? Kumulative Wirkung ? Anaerobe Bedingungen ? Humus ? Nährstoff ? Resistenz ? Brunnen ? Bodenkunde ? Gebäude ? Gelöster organischer Kohlenstoff ? Bildung ? Sorption ? Erschütterung ? Wertermittlung ? Fahrradfahren ? Standortbedingung ? Boden ? Vernässung [Boden] ? Auflösen ? BIOGEOCHEMISCH ? Buchgrundstück ? EXPERIMENT ? FORMBLAETTER ? GEGENWART ? GELOEST ? GRUNDLAGE ? KONTROLLE ? PROJEKT ? THEMA ? UNTER ? VERBAND ? VERHAELTNIS ? ANALYTISCH ? WICHTIG ? Werkzeug ? BESTANDTEIL ?

Region: Niedersachsen

License: cc-by-nc-nd/4.0

Language: Englisch/English

Organisations

• Deutsche Forschungsgemeinschaft (Bereitsteller*in)
• Leibniz Universität Hannover, Institut für Bodenkunde (Betreiber*in)
• Umweltbundesamt (Bereitsteller*in)

Time ranges: 2010-01-01 - 2025-03-31

Status

Aktiv

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