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Dynamics of Trace Metal Speciation in Periodically Reduced Soils

English title Dynamics of Trace Metal Speciation in Periodically Reduced Soils
Applicant Kretzschmar Ruben
Number 117933
Funding scheme Project funding (Div. I-III)
Research institution Institut für Biogeochemie und Schadstoffdynamik ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Pedology
Start/End 01.03.2008 - 28.02.2011
Approved amount 366'582.00
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All Disciplines (2)

Discipline
Pedology
Other disciplines of Environmental Sciences

Keywords (11)

riparian; soil; reduction; oxidation; trace metals; redox; trace elements; humic substances; sulfides; metal binding; sorption

Lay Summary (English)

Lead
Lay summary
Riparian soils form the interface between upland soils and aquatic ecosystems and between surface water and groundwater. Therefore, they are of paramount importance for the transfer of nutrients and contaminants between these systems. Periodic flooding and variations in groundwater level result in regular changes of soil redox state. Consequently, the biogeochemical processes including the cycling of trace metals are distinctly different from aerobic upland soils or permanently reduced sediments. While knowledge from aerobic soils and anoxic sediments may provide indications on trends in metal speciation under variable redox conditions, the understanding of trace metal speciation in this dynamic environment is currently limited due to the lack of studies specifically addressing these conditions. In this project, we will investigate the binding of protons, calcium, ferrous iron, and trace metals by reduced natural organic matter (NOM) and major factors affecting trace metal speciation over reduction-oxidation cycles in soils. The results of this project will contribute to the development of quantitative models for the assessment of trace metal bioavailability and mobility in periodically reduced environments.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Changes in copper and cadmium solubility and speciation induced by soil redox dynamics - competitive metal sulfide formation and interactions with natural organic matter
Fulda Beate (2013), Changes in copper and cadmium solubility and speciation induced by soil redox dynamics - competitive metal sulfide formation and interactions with natural organic matter, ETH Zürich, Zürich.
Copper redox transformation and complexation by reduced and oxidized soil humic acid. 1. X-ray absorption spectroscopy study.
Fulda B. Voegelin A. Maurer F. Christl I. Kretzschmar R. (2013), Copper redox transformation and complexation by reduced and oxidized soil humic acid. 1. X-ray absorption spectroscopy study., in Environm. Sci. Technol., 47(19), 10903-10911.
Copper redox transformation and complexation by reduced and oxidized soil humic acid. 2. Potentiometric titrations and dialysis cell experiments.
Maurer F. Christl I. Fulda B. Voegelin A. Kretzschmar R. (2013), Copper redox transformation and complexation by reduced and oxidized soil humic acid. 2. Potentiometric titrations and dialysis cell experiments., in Environ. Sci. Technol., 47(19), 10912-10921.
Reduction and Reoxidation of Humic Acid: Influence on Spectroscopic Properties and Proton Binding
Maurer F, Christl I, Kretzschmar R (2010), Reduction and Reoxidation of Humic Acid: Influence on Spectroscopic Properties and Proton Binding, in ENVIRONMENTAL SCIENCE & TECHNOLOGY, 44(15), 5787-5792.
Multi-metal contaminant dynamics during reduction of freshwater floodplain soil under sulfate-limitation
Voegelin A, Weber FA, Kretzschmar R (2009), Multi-metal contaminant dynamics during reduction of freshwater floodplain soil under sulfate-limitation, in GEOCHIMICA ET COSMOCHIMICA ACTA, 73(13), 5513-5527.
Multi-metal contaminant dynamics in temporarily flooded soil under sulfate limitation
Weber FA, Voegelin A, Kretzschmar R (2009), Multi-metal contaminant dynamics in temporarily flooded soil under sulfate limitation, in GEOCHIMICA ET COSMOCHIMICA ACTA, 73(19), 5513-5527.
Redox transformation, solid phase speciation and solution dynamics of copper during soil reduction and reoxidation as affected by sulfate availability
Fulda B. Voegelin A. Kretzschmar R., Redox transformation, solid phase speciation and solution dynamics of copper during soil reduction and reoxidation as affected by sulfate availability, in Geochim. Cosmochim. Acta.

Associated projects

Number Title Start Funding scheme
138003 Redox-induced speciation changes and reductive mobilization of arsenic and iron in highly-contaminated river floodplains 01.01.2012 Project funding (Div. I-III)
127157 Coprecipitates of hydrous ferric oxide and natural organic matter: properties and biogeochemical reactivity 01.08.2010 Project funding (Div. I-III)
135338 Influence of NOM on the dynamics of copper speciation in periodically flooded soils 01.04.2011 Project funding (Div. I-III)
156392 Mobility of trace metals in periodically flooded soils: Influence of reduced iron, manganese, and sulfur 01.05.2015 Project funding (Div. I-III)
132123 Iron(III) precipitates formed by iron(II) oxidation in natural waters: Structure, reactivity and impact on arsenic 01.02.2011 Project funding (Div. I-III)

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