A5021493294- Arsenic contamination and mitigation
- Heavy metals in environment
- Mine drainage and remediation techniques
- Iron oxide chemistry and applications
- Heavy Metal Exposure and Toxicity
- Coal and Its By-products
- Metal Extraction and Bioleaching
- Minerals Flotation and Separation Techniques
- Geochemistry and Elemental Analysis
- Phosphorus and nutrient management
- Chromium effects and bioremediation
- Electrochemical Analysis and Applications
- Climate change and permafrost
- Radioactive element chemistry and processing
- Analytical chemistry methods development
- Clay minerals and soil interactions
- Soil and Unsaturated Flow
- Methane Hydrates and Related Phenomena
- Lichen and fungal ecology
- Environmental remediation with nanomaterials
- CO2 Sequestration and Geologic Interactions
- Heavy Metals in Plants
University of Freiburg
2025
University of Bayreuth
2018-2024
Southern Cross University
2017-2020
ETH Zurich
2010-2018
Antimony (Sb) and arsenic (As) are priority environmental contaminants that often co-occur at mining-impacted sites. Despite their chemical similarities, Sb mobility in waterlogged sediments is poorly understood comparison to As, particularly across the sediment–water interface (SWI) where changes can occur millimeter scale. Combined diffusive gradients thin films (DGT) equilibration (DET) techniques provided a high resolution, situ between Sb, iron (Fe) speciation SWI contaminated...
The environmental mobility and bioavailability of antimony (Sb) are strongly influenced by sorption to Fe(III) oxide minerals, such as goethite (αFeOOH). Exposure aqueous Fe(II), occurs, for example, under reducing conditions in soils sediments, catalyzes the recrystallization goethite. Herein, we examine, first time, effect Fe(II)-catalyzed on co-associated Sb(V). use an enriched 57Fe(II) tracer provided direct evidence revealed lower levels at higher Sb(V) loadings. Goethite caused...
The environmental mobility of antimony (Sb) is controlled by interactions with iron (Fe) oxides, such as ferrihydrite. Under near-neutral pH conditions, Fe(II) catalyzes the transformation ferrihydrite to more stable phases, thereby potentially altering partitioning and speciation associated Sb. Although largely unexplored, Sb itself may also influence pathways. Here, we investigated impact on Fe(II)-induced at 7 across a range Sb(V) loadings (Sb:Fe(III) molar ratios 0, 0.003, 0.016, 0.08)....
Pyrite formation has been widely investigated because of its abundance and significance in the iron sulfur cycles many anoxic environments. The ferric-hydroxide-surface (FHS) pathway is an important for rapid pyrite formation, relying on generation surface-bound precursor species >FeIIS2-.[1] However, ferric (oxy)hydroxides are often microbially produced thus associated with organic matter (OM). Additionally, natural environments, sulfide (S(-II)) supply rates typically regulated by...
Environmental context Contamination of shooting range soils by antimony (Sb) released from corroding ammunition has become an issue public environmental concern. Because many these sites are subject to waterlogging and consequently limited aeration, we performed column experiments with contaminated soil investigate Sb mobility under such conditions. The results important for our understanding the risks arising Sb-contaminated soils, also derivation appropriate management strategies sites....
Environmental contextAntimony is an environmental contaminant of increasing concern, due to its growing industrial usage in flame retardants, lead alloys, glass, ceramics and plastics. Here we show, using X-ray absorption spectroscopy, that antimony may be trapped wetland sediments by reduced sulfur. This finding has implications for the management remediation wetlands contaminated with antimony. AbstractThe biogeochemistry (Sb) poorly characterised, despite their importance as sinks. The...
Manganese (Mn) oxides, such as birnessite (δ-MnO2), are ubiquitous mineral phases in soils and sediments that can interact strongly with antimony (Sb). The reaction between aqueous Mn(II) induce the formation of secondary Mn oxides. Here, we studied to what extent different loadings antimonate (herein termed Sb(V)) sorbed determine products formed during Mn(II)-induced transformation (at pH 7.5) corresponding changes Sb behavior. In presence 10 mM Mn(II)aq, low Sb(V)aq (10 μmol L-1)...
Schwertmannite is a metastable sulfate-rich ferric iron Fe(III) (oxyhydr)oxide and common mineral in acid mine drainage sites sulfate soils. also used as sorbent various industrial applications, including phosphate removal water treatment environmental remediation. Phosphate sorption to schwertmannite, however, complex likely involves ligand exchange for inner- outer-spherically coordinated groups, both on the surface tunnel structure of mineral. Here, we investigated sorption, concomitant...