A5044809754- Mercury impact and mitigation studies
- Heavy Metal Exposure and Toxicity
- Geology and Paleoclimatology Research
- Heavy metals in environment
- Geological formations and processes
- Groundwater and Isotope Geochemistry
- Fish biology, ecology, and behavior
- Soil erosion and sediment transport
- Geochemistry and Geologic Mapping
- Geochemistry and Elemental Analysis
- Hydrology and Sediment Transport Processes
- Isotope Analysis in Ecology
- Water Quality and Pollution Assessment
- Mining and Resource Management
- Water Resource Management and Quality
- Hydrology and Watershed Management Studies
- Air Quality and Health Impacts
- Geography and Environmental Studies
- Marine and coastal ecosystems
- Aquatic Ecosystems and Phytoplankton Dynamics
- Toxic Organic Pollutants Impact
- Atmospheric and Environmental Gas Dynamics
- Geomagnetism and Paleomagnetism Studies
- Microplastics and Plastic Pollution
- Amazonian Archaeology and Ethnohistory
Géosciences Environnement Toulouse
2015-2024
Observatoire Midi-Pyrénées
2014-2024
Université de Toulouse
2010-2023
Centre National de la Recherche Scientifique
2014-2023
Université Toulouse III - Paul Sabatier
2011-2023
Institut de Recherche pour le Développement
2014-2023
Universidad Andina Simón Bolívar
2017-2021
Institute for Sustainable Development
2021
Institut de Recherche pour le Développement
2013
Institut de Recherche pour le Développement
2010
Residual solid products of erosion display a wide range size, density, shape, mineralogy, and chemical composition are hydrodynamically sorted in large river channels during their transport. We characterize the isotopic variability sediments Amazon Basin, collected at different water depths, as function grain size. Absolute concentrations Sr Nd ratios greatly varies along channel depth. The Al/Si ratio, tightly linked to size distribution, systematically decreases with depth, mostly...
The isotopic composition of atmospheric total gaseous mercury (TGM) and particle-bound (PBM) (Hg) in litterfall samples have been determined at urban/industrialized rural sites distributed over mainland China for identifying Hg sources transformation processes. TGM PBM near anthropogenic emission display negative δ(202)Hg near-zero Δ(199)Hg contrast to relatively positive observed remote regions, suggesting that different processes force the mass-dependent fractionation (MDF)...
We determined the concentrations and compositions of coarse particulate (>63 µm), fine (0.1–63 dissolved (0.001–0.1 µm) organic matter collected along a river reach extending from first‐order stream in Bolivian Andes, through Beni River system, to lower Madeira Amazon Rivers. Dissolved carbon (DOC) increased down total ~80 350 µM. The percentage DOC with molecular weight greater than ~1,000 atomic mass units that could be isolated by ultrafiltration also downstream 40 80%. Weight...
Research Article| March 01, 2010 Oxidation of petrogenic organic carbon in the Amazon floodplain as a source atmospheric CO2 Julien Bouchez; Bouchez 1Institut de Physique du Globe Paris, CNRS-UMR 7154, 4, place Jussieu 75252 Paris cedex 05, France2Université Diderot, 75205 13, France Search for other works by this author on: GSW Google Scholar Olivier Beyssac; Beyssac 3Laboratoire Géologie, Ecole Normale Supérieure, 8538, 24 rue Lhomond, 75231 Valier Galy; Galy 4Woods Hole Oceanographic...
Research Article| May 01, 2011 Sediment production and delivery in the Amazon River basin quantified by situ–produced cosmogenic nuclides recent river loads Hella Wittmann; Wittmann * † 1Institut für Mineralogie, Universität Hannover, Callinstrasse 3, 30167 Germany *Present address: GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Search for other works this author on: GSW Google Scholar Friedhelm von Blanckenburg; Blanckenburg Laurence Maurice; Maurice 2Université de Toulouse, Université...
The composition, sources, and age of particulate organic matter were determined in an Amazonian river‐floodplain system during rising, high, falling, low water periods over 7 yr (1999–2006), a mass balance for total carbon (dissolved particulate) was estimated. Curuai floodplain, composed several temporally interconnected lakes, is permanently connected to the Amazon River via channels. Organic (OM) imported floodplain from mainly rising period produced exported river high falling periods....
Exposure of humans and wildlife to various inorganic organometallic forms mercury (Hg) may induce adverse health effects. While human populations in developed countries are mainly exposed marine fish monomethylmercury (MMHg), this is not necessarily the case for developing diverse indigenous people. Identification Hg exposure sources from biomonitor media such as urine or hair would be useful combating exposure. Here we report on stable isotope signatures speciation across different gold...
We report mercury (Hg) mass-dependent isotope fractionation (MDF) and mass-independent (MIF) in hair samples of the Bolivian Esse Ejjas native people several tropical fish species that constitute their daily diet. MDF with δ202Hg ranging from −0.40 to −0.92 ‰ for +1.04 +1.42 was observed. Hair a fish-dominated diet are enriched by +2.0 ± 0.2 relative consumed. Both odd Hg isotopes, 199Hg 201Hg, display MIF (from −0.14 +0.38 Δ201Hg −0.09 +0.55 Δ199Hg) +0.12 +0.66 +0.14 +0.81 Δ199Hg). No...
This work presents the simultaneous online determination of isotopic composition different Hg species in a single sample by hyphenation gas chromatography (GC) with multicollector-inductively coupled plasma mass spectrometry (MC-ICPMS). With use commercially available instrumentation, precise and accurate species-specific isotope δ values (per mil deviation ratio relative to reference standard) have been obtained from consecutive GC transient signals. The isothermal temperature programs...