A5059568809- Arsenic contamination and mitigation
- Mine drainage and remediation techniques
- Heavy metals in environment
- Heavy Metal Exposure and Toxicity
- Radioactive element chemistry and processing
- Groundwater and Isotope Geochemistry
- Coal and Its By-products
- Fluoride Effects and Removal
- Analytical chemistry methods development
- Geochemistry and Elemental Analysis
- Metal Extraction and Bioleaching
- Iron oxide chemistry and applications
- Chemical Synthesis and Characterization
- Selenium in Biological Systems
- Electrochemical Analysis and Applications
- Groundwater flow and contamination studies
- Chemical Analysis and Environmental Impact
- Methane Hydrates and Related Phenomena
- Radioactive contamination and transfer
- Geochemistry and Geologic Mapping
- Geology and Paleoclimatology Research
- Microbial Community Ecology and Physiology
- Environmental Toxicology and Ecotoxicology
- Radioactivity and Radon Measurements
- Peatlands and Wetlands Ecology
University of Bayreuth
2016-2025
Planta Piloto de Procesos Industriales Microbiológicos
2021
European Synchrotron Radiation Facility
2009-2010
Trent University
2007-2010
TU Bergakademie Freiberg
2001-2009
United States Geological Survey
2007
University of Georgia
2007
Abstract Projections of global rice yields account for climate change. They do not, however, consider the coupled stresses impending change and arsenic in paddy soils. Here, we show a greenhouse study that future conditions cause greater proportion pore-water arsenite, more toxic form arsenic, rhizosphere Californian Oryza sativa L. variety M206, grown on soil. As result, grain decrease by 39% compared to at today’s soil concentrations. In addition, climatic nearly twofold increase inorganic...
Abstract Phosphorus availability in soils is an important parameter influencing primary production terrestrial ecosystems. limitation exists many since a high proportion of soil phosphorus stored unavailable forms for plants, such as bound to iron minerals or stabilized organic matter. This spite having amount total phosphorus. The feasibility silicon mobilize from strong binding sites has been shown marine sediments but less well studied soils. Here we tested the effect on mobilization 143...
Mono-, di-, tri-, and tetrathioarsenate, as well methylated arsenic oxy- thioanions, were determined besides arsenite arsenate in geothermal waters of Yellowstone National Park using anion-exchange chroma tography inductively coupled plasma mass spectrometry. Retention time match with synthetic standards, measured S:As ratios, molecular electrospray spectra support the identification. Acidification was unsuitable for species preservation sulfidic waters, HCl addition causing loss total...
From the contents Theoretical Background.- Hydrogeochemical Modeling Programs.- Exercises.- Solutions.- References.- Index.
ABSTRACT The remediation of metal-contaminated soils by phytoextraction depends on plant growth and metal accessibility. Soil microorganisms can affect the accumulation metals plants either directly or indirectly stimulating activity (im)mobilizing and/or complexing metals. Understanding intricate interplay metal-accumulating with their rhizosphere microbiome is an important step toward application optimization phytoremediation. We compared effects a “native” strongly disturbed...
Cadmium (Cd) is of environmental relevance as it enters soils via Cd-containing phosphate fertilizers and endangers human health when taken up by crops. Cd known to associate with Fe(III) (oxyhydr)oxides in pH-neutral slightly acidic soils, though not well understood how the interrelation Fe changes under Fe(III)-reducing conditions. Therefore, we investigated mobility a Cd-bearing soil faced organic carbon input reducing Using fatty acid profiles quantitative PCR, found that both fermenting...
Polysulfides are often referred to as key reactants in the sulfur cycle, especially during interaction of ferric (hydr)oxides and sulfide, forming ferrous-sulphide minerals. Despite their potential relevance, extent polysulfide formation its relevance for product pathways remains enigmatic. We applied cryogenic X-ray Photoelectron Spectroscopy wet chemical analysis study oxidation products reaction goethite lepidocrocite with aqueous sulfide at different initial Fe/S molar ratios under...
Arsenic (As) accumulation in rice is of global concern for human health and international trade. Rice typically reported to contain inorganic As (iAs) dimethylated arsenate (DMA), with current food guidelines limiting toxic iAs but not less-toxic DMA. Here, we show that the highly monothioarsenate (DMMTA) also found worldwide has been unknowingly determined as DMA by previous routine analytical methods. Using enzymatic extraction followed high-performance liquid chromatography–inductively...
The association of arsenic (As) with colloidal particles could facilitate its transport to adjacent water systems or alter availability in soil–rice systems. However, little is known about the size distribution and composition particle-bound As paddy soils, particularly under changing redox conditions. Here, we incubated four As-contaminated soils distinctive geochemical properties study mobilization during soil reduction subsequent reoxidation. Using transmission electron microscopy–energy...
Water management in paddy soils can effectively reduce the soil-to-rice grain transfer of either As or Cd, but not both elements simultaneously due to higher mobility under reducing and Cd oxidizing soil conditions. Limestone amendment, common form liming, is well known for decreasing accumulation rice grown on acidic soils. Sulfate amendment was suggested decrease rice, especially intermittent flooding. To study unknown effects combined sulfate limestone flooding we performed a pot...
Sulfur and arsenic often coexist in the environment share similar microbial redox transformations. We examined effects of sulfide on aerobic arsenite oxidation alkaline lake water samples laboratory enrichment cultures. Significant occurred only treatments with bacteria present, production arsenate was greatly enhanced by addition or thiosulfate. IC-ICP-MS analysis showed that mono- dithioarsenate formed + amended water. Our data indicate these two thioarsenic compounds are fairly stable...
In recent years, analytical methods have been developed that demonstrated soluble arsenic-sulfur species constitute a major fraction of dissolved arsenic in sulfidic waters. However, an intense debate is going on about the exact chemical nature these compounds, since X-ray absorption spectroscopy (XAS) data generated at higher (mmol/L) concentrations suggest presence (oxy)thioarsenites such waters, while ion chromatographic (IC) and mass spectroscopic lower (μmol/L to nmol/L) indicate...
Summary Batch experiments were conducted to study the uranium U(VI) sorption onto bentonite as a function of pH (3 8), and initial concentrations (5 × 10 −6 5 −5 M) in presence absence sulfate, carbonate, phosphate. Uranium depended on concentration with stronger at lower was high over wide range complexing ligands. In 0.005 M reduced low values due competition between SO 4 2− uranyl ion for sites surface, or formation uranyl-sulfate complexes. 0.003 decreased sharply above 7, because...
ABSTRACT Iron(III) (oxyhydr)oxides can represent the dominant microbial electron acceptors under anoxic conditions in many aquatic environments, which makes understanding mechanisms and processes regulating their dissolution transformation particularly important. In a previous laboratory-based study, it has been shown that 0.05 mM thiosulfate reduce 6 ferrihydrite indirectly via enzymatic reduction of to sulfide by sulfur-reducing bacterium Sulfurospirillum deleyianum , followed abiotic...