A5088653304- Mercury impact and mitigation studies
- Heavy Metal Exposure and Toxicity
- Isotope Analysis in Ecology
- Heavy metals in environment
- Toxic Organic Pollutants Impact
- Geology and Paleoclimatology Research
- Analytical chemistry methods development
- Marine and environmental studies
- Marine animal studies overview
- Thallium and Germanium Studies
- Marine and coastal ecosystems
- Environmental Toxicology and Ecotoxicology
- Marine Biology and Environmental Chemistry
- Ion-surface interactions and analysis
- Geochemistry and Elemental Analysis
- Arsenic contamination and mitigation
- Air Quality and Health Impacts
- Water Treatment and Disinfection
Université Savoie Mont Blanc
2018-2024
Vrije Universiteit Brussel
2022-2023
Université Gustave Eiffel
2018-2022
Université Grenoble Alpes
2018-2022
Institut des Sciences de la Terre
2018-2022
Centre National de la Recherche Scientifique
2010-2022
Institut de Recherche pour le Développement
2016-2022
National High Magnetic Field Laboratory
2019
Florida State University
2019
Observatoire Midi-Pyrénées
2010-2016
This study presents the determination and comparison of isotopic compositions Hg in sediments, plankton, roach, perch two freshwater systems Lake Baikal−Angara River aquatic ecosystem: man-made Bratsk Water Reservoir contaminated by from a chlor-alkali factory noncontaminated Baikal. Isotopic ratios biota exhibit both significant mass-independent fractionation (MIF) (Δ199Hg 0.20 to 1.87‰) mass-dependent (MDF) (δ202Hg −0.97 −0.16‰), whereas sediments high MDF −1.99 −0.83‰) but no MIF. δ15N...
Abstract Mercury (Hg) stable isotopes provide a new tool to trace the biogeochemical cycle of Hg. An inventory isotopic composition historical anthropogenic Hg emissions is important understand sources and post-emission transformations We build on existing global inventories atmosphere develop first corresponding isotope for total (THg) three species: gaseous elemental (GEM), oxidized (GOM) particulate-bound (PBM). compile δ202Hg Δ199Hg major source materials. Where possible, values in are...
Mercury undergoes several transformations that influence its stable isotope composition during a number of environmental and biological processes. Measurements Hg isotopic mass-dependent (MDF) mass-independent fractionation (MIF) in food webs may therefore help to identify major sources processes leading significant bioaccumulation methylmercury (MeHg). In this work, δ13C, δ15N, concentration species (MeHg, inorganic Hg), were determined at different trophic levels the remote pristine Lake...
Inorganic mercury (iHg) methylation in aquatic environments is the first step leading to monomethylmercury (MMHg) bioaccumulation food webs and might play a role Hg isotopic composition measured sediments organisms. Methylation by sulfate reducing bacteria (SRB) under sulfate-reducing conditions probably one of most important sources MMHg natural environments, but its influence on remains be ascertained. In this context, methylating SRB Desulfovibrio dechloracetivorans (strain BerOc1) was...
A new approach was demonstrated for the isotope ratio measurement in different elemental species of Hg using transient signal obtained by chromatography coupled with multicollector-inductively plasma mass spectrometry (MC-ICPMS). The method based on slope linear regression intensities isotopes shows improved accuracy and reproducibility (0.2−0.5‰ as 2 standard deviation (SD)). Internal precision (RSD) is very close to theoretical value given counting statistic better a factor 6 comparison...
In the last decade, specific attention has been paid to total mercury (HgT) stable isotopic composition, especially in natural samples such as aquatic organisms, due its potential track cycle of this toxic element environment. Here, we investigated Hg Compound Specific Isotopic Composition (CSIC) inorganic (iHg) and methylmercury (MMHg) various tissues mammals (Beluga whale from Arctic marine environment seals freshwater lake Baikal, Russia). seals' organs variation mass dependent...
We used natural mercury (Hg) stable isotopes to investigate the Hg cycle in a rainforest soil catena (French Guiana) partially gold-mined during early 1950s. Litterfall showed homogeneous Δ199Hg values [−0.18 ± 0.05‰, i.e., modern gaseous elemental (GEM) isotopic signature]. After litter decomposition, bound organic matter (OM) is mixed with from pristine (−0.55 0.22‰) or (−0.09 0.16‰) mineral materials. Negative deep horizons (−0.60 suggest transfer of dissolved OM depleted odd due...
Decadal time trends of mercury (Hg) concentrations in Arctic biota suggest that anthropogenic Hg is not the single dominant factor modulating exposure to wildlife. Here, we present speciation (monomethyl-Hg) and stable isotopic composition (C, N, Hg) 53 Alaskan ringed seal liver samples covering a period 14 years (1988–2002). In vivo metabolic effects foraging ecology explain most observed 1.6 ‰ variation δ202Hg, but Δ199Hg. Ringed habitat use migration were likely factors explaining Δ199Hg...
A methodology to simultaneously determine mercury (MeHg, IHg) and butyltin (TBT, DBT, MBT) compounds in eel samples was assessed validated using multiple isotopically enriched species. The developed able analyse the organometal species accurately precisely correct for potential transformations/degradations of different during various steps analytical procedure. Low detection limits were achieved (0.007–0.17 µg Hg kg−1 (Hg) 0.42–0.71 Sn tin (Sn) species) allowing analysis low-mass thus at...
In this study, the vertical distribution of Mercury (Hg) in estuarine and marine sediment porewaters solid phases was assessed by conventional passive sampling techniques historically polluted Scheldt Estuary Belgian Coastal Zone (BCZ). The DGT measured labile Hg (HgLA) concentrations were mostly lower than porewater (HgPW) concentrations, they also presented different patterns. concentration these showed still high levels comparable to historical ones. Amongst several physico-chemical...