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Your search keyword '"Laure Laffont"' showing total 2 results
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2 results on '"Laure Laffont"'

1. From uncertainty to environmental impacts: reflection on the threats to water in Chacabuco Province (Chile): a combined approach in social sciences and geochemistry

Author

Lucie Le Goff, Frédérique Blot, Anne Peltier, Laure Laffont, Sylvia Becerra, Cristián Henríquez Ruiz, Jorge Qüense Abarzua, Magali Philippe, Martin Paegelow, Ludovic Menjot, Gauthier Delplace, and Eva Schreck

Subjects
Global and Planetary Change, Health (social science), Sociology and Political Science, Ecology, Geography, Planning and Development, Management, Monitoring, Policy and Law, Nature and Landscape Conservation
Published
2022
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2. Mercury speciation analysis in human hair by species-specific isotope-dilution using GC–ICP–MS

Author

Jeroen E. Sonke, David Amouroux, Laurence Maurice, Patricia Navarro, Laure Laffont, Philippe Behra, Mathilde Monperrus, Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Géosciences Environnement Toulouse (GET), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Université de Pau et des Pays de l'Adour (UPPA), Laboratoire de Chimie Analytique Bio-Inorganique et Environnement (LCABIE), Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS), Chimie Agro-Industrielle (CAI), Institut National de la Recherche Agronomique (INRA)-Ecole nationale supérieure des ingénieurs en arts chimiques et technologiques-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Interregional Midi-Pyrenees-Aquitaine, French National Research Agency (ANR CES) within the IDEA project, Basque Government, and [ERC-StG-20091028]

Subjects
SAMPLES, Speciation, Indicator Dilution Techniques, chemistry.chemical_element, Hydrochloric acid, MALAYSIA, METHYLMERCURY, 010501 environmental sciences, Isotope dilution, Mass spectrometry, Methylation, Sensitivity and Specificity, 01 natural sciences, Biochemistry, Gas Chromatography-Mass Spectrometry, Analytical Chemistry, Mass spectrometry/ICP-MS, Biological samples, chemistry.chemical_compound, AMAZON, ETHYLATION, Nitric acid, [SDV.IDA]Life Sciences [q-bio]/Food engineering, Humans, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, EXPOSURE, Inductively coupled plasma mass spectrometry, 0105 earth and related environmental sciences, Demethylation, Tetramethylammonium hydroxide, Organometals, Chromatography, 010401 analytical chemistry, MASS-SPECTROMETRY, Mercury, QUANTIFICATION, Methylmercury Compounds, ATOMIC FLUORESCENCE SPECTROMETRY, 0104 chemical sciences, Mercury (element), Mercury Isotopes, chemistry, Metals/heavy metals, NEUTRON-ACTIVATION ANALYSIS, Hair
Abstract

International audience; We optimized a mercury (Hg) speciation extraction method for human hair in combination with species-specific isotope-dilution analysis by gas chromatography-inductively coupled plasma-mass spectrometry (GC-ICP-MS). The method was validated on human hair reference material RM (IAEA-086), which is recommended for analysis of monomethylmercury (MMHg) and inorganic mercury (IHg). Three reagents, hydrochloric acid (HCl), nitric acid (HNO3), and tetramethylammonium hydroxide (TMAH), and three extraction procedures, at ambient temperature for 12 h, microwave-assisted at 75 A degrees C for 6 min, and oven heated at 80 A degrees C for 2 h were tested. Extraction efficiency, recovery, and potential species transformations were evaluated for each method. The most efficient procedures, with recovery of similar to 90 % for each species with limited demethylation (< 5 %) and methylation (0 %), were HNO3 digestion, irrespective of temperature, and microwave-assisted TMAH extraction. Acidic extraction with HCl induces significant demethylation, with production of artifacts. To correct for potential demethylation artifacts we recommend spiking with isotopically enriched standards before the extraction step.

Published
2012
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