A5060862437- Radioactive element chemistry and processing
- Clay minerals and soil interactions
- Geochemistry and Geologic Mapping
- Soil and Unsaturated Flow
- Geology and Paleoclimatology Research
- Iron oxide chemistry and applications
- Selenium in Biological Systems
- Geological formations and processes
- Mine drainage and remediation techniques
- Nuclear materials and radiation effects
- Heavy metals in environment
- Hydrocarbon exploration and reservoir analysis
- Nuclear and radioactivity studies
- Radioactive contamination and transfer
- Groundwater and Isotope Geochemistry
- Silicon Effects in Agriculture
- Coal and Its By-products
- Geochemistry and Elemental Analysis
- Peatlands and Wetlands Ecology
- Grouting, Rheology, and Soil Mechanics
- Soil erosion and sediment transport
- Karst Systems and Hydrogeology
- Groundwater flow and contamination studies
- Electrochemical Analysis and Applications
- Mineralogy and Gemology Studies
Netherlands Organisation for Applied Scientific Research
2020-2024
Utrecht University
2016-2020
Redox reactions control the environmental fate of selenium, an element concern due to its small gap between beneficial and detrimental effects on human health longevity radionuclide 79Se produced in nuclear reactors. Fe-bearing clay minerals are major redox-active ingredients Earth's critical zone constitute important component barrier (radioactive other) waste repositories. Here we systematically investigate selenite (Se(IV)O32−) sorption reduction by smectite group, using batch experiments...
In the Netherlands, Paleogene clay layers are eligible for final disposal of radioactive waste. Geoscientific information from these deposits is essential to assess their suitability. An important aspect prediction geochemical behavior radionuclides in layers. Such can be studied by laboratory experiments. However, experiments relatively short-term compared expected migration period if released engineered containment waste and it very challenging imitate representative conditions an above...
After isolation of radioactive waste in deep geological formations, radionuclides can enter the biosphere via slow migration through engineered barriers and host rocks. The amount that migrate into depends on distance from a repository, dominant transport mechanism (diffusion vs. advection), interaction dissolved with minerals present rock barrier systems. Within framework European Union’s Horizon 2020 EURAD project ( https://www.ejp-eurad.eu/ ), series state-of-the-art reports, which form...
The redox reaction between natural Fe-containing clay minerals and its sorbates is a fundamental process controlling the cycles of many elements such as carbon, nutrients, redox-sensitive metals, metalloids (e.g., Co, Mn, As, Se), inorganic well organic pollutants in Earth's critical zone. While structure under oxic conditions well-known, less known about their behavior anoxic reducing conditions, thereby impeding full understanding mechanisms clay-driven reduction oxidation (redox)...
Abstract The Rupel Clay member in the Netherlands largely corresponds to Boom Formation Belgium, and this marine, clay-rich deposit is a potential candidate host radioactive waste disposal facilities. Prediction of speciation radionuclides pore water their retardation by interactions with components requires knowledge about composition water, inventory reactive solids understanding between water. Here, we studied material which was obtained from cores collected province Zeeland, Netherlands,...
Abstract The speciation of selenium (Se) in clay-rich host rocks is important within the framework geological disposal radioactive waste since it affects its migration. Removal selenite from formation water can be caused by reduction and adsorption. Reduction could potentially inhibited or delayed Here, interplay adsorption was investigated batch experiments with Boom Clay separated size fractions. In all experiments, dissolved Se concentrations (Se aq ) showed a fast initial decrease that...
The Boom Clay (BC) in Belgium and the Opalinus (OPA) Switzerland are studied as potential host rocks for radioactive waste disposal frame of national programmes. In assessment long-term natural barrier evolution, redox capacity is an important physical-chemical parameter to consider it may affect speciation migration behavior released radionuclides from waste. this respect, iron plays role electron transfer thus influence transport many sensitive radionuclides. clay minerals, commonly...
Peatlands in the Netherlands contain high amounts of sulfur (S). Drainage these peatlands has led to oxidation peat, more recently enhanced through extended drought periods from result climate change. Oxidation peat leads mobilization S and elevated sulfate levels surface waters. High concentrations are considered a water quality problem can enhance eutrophication. In this study, content speciation Dutch peats were investigated their relation paleoenvironment current land-use. Peat samples...
Clay minerals play an important role as barrier in radioactive waste storage. In addition to their function hydraulic barrier, clay can also immobilize radionuclides by adsorption and redox reactions with radionuclides. Reduction of redox-active such  technetium selenium smectites has already been shown. Many contain iron (Fe) structure, however, not all this structural Fe is accessible for reactions. This depend on multiple factors the quantity coordination mineral structure. While...