A5025610601- Mercury impact and mitigation studies
- Toxic Organic Pollutants Impact
- Environmental Toxicology and Ecotoxicology
- Analytical chemistry methods development
- Isotope Analysis in Ecology
- Heavy Metal Exposure and Toxicity
- Marine Biology and Environmental Chemistry
- Pharmaceutical and Antibiotic Environmental Impacts
- Heavy metals in environment
- Microbial Community Ecology and Physiology
- Marine animal studies overview
- Reproductive biology and impacts on aquatic species
- Water Treatment and Disinfection
- Microplastics and Plastic Pollution
- Turtle Biology and Conservation
- Marine Biology and Ecology Research
- Pesticide Residue Analysis and Safety
- Environmental Chemistry and Analysis
- Recycling and Waste Management Techniques
- Analytical Chemistry and Chromatography
- Fish Ecology and Management Studies
- Aquaculture Nutrition and Growth
- Methane Hydrates and Related Phenomena
- Marine and coastal ecosystems
- Pharmacological Effects and Assays
Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux
2016-2025
Université de Pau et des Pays de l'Adour
2015-2025
Centre National de la Recherche Scientifique
2016-2025
Laboratoire de Chimie
2003-2016
Institut de Physique de Rennes
2014-2016
Sage (United Kingdom)
2005
Centre Hospitalier Universitaire de Rennes
2005
This work reports the first results on stable isotope fractionation of Hg during methylation by anaerobic bacteria under dark conditions. The GC-MC-ICPMS methodology employed is capable simultaneously measuring species-specific isotopic composition different species within same sample. We have studied caused Hg(II) standard reference material NIST-3133 in presence pure bacterial strain Desulfobulbus propionicus MUD10 (DSM 6523) fermentative measured and monomethyl mercury (MMHg) these...
Mercury methylation has been extensively reported in the literature among "Firmicutes" and "Proteobacteria." Nevertheless, results are hardly comparable because of differences initial inorganic mercury concentrations used. The use stable isotopic tracers now permits to study transformations at close environmental levels. Here, several strains, including strict fermentative sulphate-reducing bacteria, were tested for their capacities compared with data available date. Under such conditions,...
Abstract The use of species‐specific isotopic tracers for inorganic and methyl mercury has allowed the simultaneous determination methylation demethylation potentials pure culture isolated sulfate‐reducing (SR) bacterial strains using low Hg species concentration levels (7 µg/L 199 Hg(II), 1 Me 201 Hg). A major advantage method reported here is that it can be used to follow simultaneously both degradation added but also formation their products thus during same incubation specific...
The sources and factors controlling concentrations of monomethylmercury (MMHg) in aquatic ecosystems need to be better understood. Here, we investigated Hg transformations sediments, periphyton associated with green algae's or plants, benthic biofilms from the Lake Titicaca hydrosystem compared them occurrence active methylating microorganisms extracellular ligands. Intense methylation was found periphyton, while it remained low sediments plants' periphyton. Demethylation varied between...
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...
Speciated isotope-dilution mass spectrometry (SID-MS) is claimed to be an absolute method; however, it has been found affected by artifact monomethylmercury (MMHg) formation in sediments. The determination of MMHg sediments was carried out SID-MS after open-focused microwave extraction. extracted mercury species were then ethylated and separated capillary gas chromatography (CGC). Isotope ratios (peak area at different masses) measured on-line ICP-MS detection the CGC-separated compounds....