A5107852208- Groundwater and Isotope Geochemistry
- Geology and Paleoclimatology Research
- Geochemistry and Elemental Analysis
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
- Radioactive contamination and transfer
- Radioactive element chemistry and processing
- Heavy metals in environment
- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- earthquake and tectonic studies
- Geological and Geophysical Studies Worldwide
- Analytical chemistry methods development
- Coral and Marine Ecosystems Studies
- Nuclear Physics and Applications
- Geological formations and processes
- Plant Micronutrient Interactions and Effects
- Groundwater flow and contamination studies
- Ocean Acidification Effects and Responses
- Mass Spectrometry Techniques and Applications
- Geological and Geophysical Studies
- Chemical Synthesis and Characterization
- Marine Biology and Ecology Research
- Mercury impact and mitigation studies
- Clay minerals and soil interactions
Université Paris Cité
2014-2024
Centre National de la Recherche Scientifique
2014-2024
Institut de physique du globe de Paris
2015-2024
Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux
2022-2024
Université de Pau et des Pays de l'Adour
2023-2024
Sorbonne Paris Cité
2012-2021
Délégation Ile-de-France Villejuif
2019
Délégation Paris 6
2014-2015
Délégation Paris 7
2014-2015
Sorbonne Université
2009
Recent reports suggest that significant fractionation of stable metal isotopes occurs during biogeochemical cycling and the uptake into higher plants is an important process. To test isotopic copper (Cu) zinc (Zn) plant constrain its controls, we grew lettuce, tomato, rice durum wheat under controlled conditions in nutrient solutions with variable speciation iron (Fe) supply. The results show patterns these two micronutrients are decoupled transport from solution to root. In roots, found...
Zinc isotopic fractionation during adsorption onto a purified humic acid (PHA), an analogue of organic matter (OM), has been investigated experimentally as function pH. The Donnan Membrane device (DM) was used to separate Zn bound the PHA from free Zn2+ ions in solution and allowed us measure ratios Zn2+. Below pH 6, on resulted no measurable fractionation, while at higher pH, heavier than (Δ66ZnPHA-FreeZn2+ = +0.24 ‰ ± 0.06 2σ, n 4). This can be explained by changes speciation with...
The use of zinc (Zn) isotope ratios as a tracer anthropogenic contamination has been assessed using an extensive collection river water samples from the Seine River basin (France) collected between 2004 and 2007. 66Zn/64Zn (expressed δ66Zn) dissolved Zn have measured by MC-ICP-MS after chemical separation improved technique adapted to large volumes water. Significant isotopic variations (0.07−0.58‰) occur along transect pristine areas estuary with time in Paris, are coherent enrichment...
In this study, we quantify zinc isotope fractionation during its sorption onto kaolinite, by performing experiments under various pH, ionic strength, and total Zn concentrations. A systematic enrichment in heavy isotopes on the surface of kaolinite was measured, with Δ66Znadsorbed-solution ranging from 0.11‰ at low pH strength to 0.49‰ high strength. Both measured concentration isotopic ratio are correctly described using a thermodynamic model that considers two binding sites: external basal...
Infiltration of effluents from wastewater treatment plants (WWTP) into groundwater can be a source Contaminants Emerging Concern (CECs), such as pharmaceutical compounds, that are not fully removed during the processes. A multi-tracer approach, based on hydrogeochemical, isotopic, and organic tracers, is applied in Vistrenque Aquifer (Gard, France) to assess dispersion unintentional plumes its potential implication quality for CECs small catchment area. In this area, point WWTP effluent...
This study investigates dissolved, suspended loads and sands of major Icelandic rivers determines chemical mechanical erosion rates as well CO<sub>2</sub> consumption by the weathering. A steady state model is used to locally calculate river load fluxes needed balance The total dissolved solid concentrations range from 20 179 mg/kg. highest are for spring fed draining young rocks in vicinity active volcanoes, lowest direct runoff old Tertiary rocks. Total loads, "corrected" atmospheric,...
The oceanic mass balance of calcium (Ca) is defined by a between the inputs (rivers and hydrothermal) outputs (bulk carbonate) Ca. Large rivers were analyzed for Ca isotope ratios ( 44 Ca/ 42 Ca, expressed as Ca) to investigate source cycling riverine add an isotopic constraint budget new data account approximately one‐third total supplied oceans rivers. Inter‐sample seasonal variability was assessed analyzing more than one sample many range in large at high water stand extremely narrow...
We report here an optimisation of the demountable direct injection high efficiency nebuliser (d‐DIHEN) for isotopic measurements with a Neptune (ThermoFisher Scientific, Bremen, Germany) multi‐collector inductively coupled plasma‐mass spectrometer (MC‐ICP‐MS) and describe method boron ratio determination. With nebulisation 100% analyte was introduced into ICP‐MS plasma wash times were drastically reduced elements such as thorium. Compared to classical stable introduction system (SIS: double...
Abstract. The "δ11B-pH" technique was applied to modern and ancient corals Porites from the sub-equatorial Pacific areas (Tahiti Marquesas) spanning a time interval 0 20.720 calendar years determine amplitude of pH changes between Last Glacial Period Holocene. Boron isotopes were measured by Multi-Collector – Inductively Coupled Plasma Mass Spectrometry (MC-ICPMS) with an external reproducibility 0.25‰, allowing precision about ±0.03 pH-units for values 8 8.3. boron concentration [B]...