A5007618804- Radioactive element chemistry and processing
- Radioactive contamination and transfer
- Lanthanide and Transition Metal Complexes
- Analytical chemistry methods development
- Chemical and Physical Properties in Aqueous Solutions
- Chemical Synthesis and Characterization
- Nuclear Materials and Properties
- Geochemistry and Geologic Mapping
- Atmospheric and Environmental Gas Dynamics
- Laser-induced spectroscopy and plasma
- Electrochemical Analysis and Applications
- Radioactivity and Radon Measurements
- Photochemistry and Electron Transfer Studies
- Mine drainage and remediation techniques
- Innovative Microfluidic and Catalytic Techniques Innovation
- Geochemistry and Elemental Analysis
- Analytical Chemistry and Chromatography
- Nuclear and radioactivity studies
- Microfluidic and Capillary Electrophoresis Applications
- Nuclear materials and radiation effects
- Mercury impact and mitigation studies
- Nuclear reactor physics and engineering
- Spectroscopy and Quantum Chemical Studies
- Chemical Thermodynamics and Molecular Structure
- Nuclear Physics and Applications
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2014-2023
Université Paris-Saclay
2016-2023
CEA Paris-Saclay
2011-2023
CEA Paris-Saclay - Etablissement de Saclay
2009-2021
Université d'Évry Val-d'Essonne
2005-2019
Centre National de la Recherche Scientifique
2005-2019
Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Énergie
2018
Service Interdisciplinaire sur les Systèmes Moléculaires et les Matériaux
2018
Direction des énergies
2005-2017
Digital Heritage Netherlands
2014
Exceptionally high concentrations of natural uranium have been found in drinking water originating from drilled wells Southern Finland. However, no clear clinical symptoms observed among the exposed population. Hence a question arose as to whether speciation could be one reason for lack significant adverse health effects. Uranium species were determined using time-resolved laser-induced fluorescence spectroscopy. We performed multi-element chemical analyses these samples, and predictive...
The formation constants of UO2SO4 (aq), UO2(SO4)22−, and UO2(SO4)34− were measured in aqueous solutions from 10 to 75 °C by time-resolved laser-induced fluorescence spectroscopy (TRLFS). A constant enthalpy reaction approach was satisfactorily used fit the thermodynamic parameters stepwise complex reactions a 0.1 M Na+ ionic medium: log10 K1(25 °C) = 2.45 ± 0.05, ΔrH1 29.1 4.0 kJ·mol−1, K2(25 1.03 0.04, ΔrH2 16.6 4.5 kJ·mol−1. While UO2(SO4)22− is good agreement with calorimetric data, that...
The causes of isotope ratio drifts observed in LC-MC-ICPMS experiments could be explained by both mass dependent isotopic fractionation on the chromatographic column and distinct time lags between amplifier responses Faraday cup configuration.
Sulfate complexation of lanthanides is great interest for predicting speciation radionuclides in natural environments. The formation LaSO4+(aq) HNO3/H2SO4 aqueous solutions low ionic strength (I) was studied by nanoelectrospray ionization mass spectrometry (nanoESI-MS). Several gaseous species containing LaSO4+ were detected. constant determined and extrapolated to I = 0 (log 3.5 ± 0.3) using a simple specific ion interaction theory (SIT) formula. This value supports the potential nanoESI-MS...
In the framework of nuclear waste disposal, it is very important to well understand behavior actinides in presence common environmental inorganic ligands such as sulfate and chloride. this work, AnO2SO4(-) AnO2Cl 1-1 complexes have been evidenced by capillary electrophoresis-inductively coupled plasma mass spectrometry (CE-ICPMS) perchlorate/chloride perchlorate/sulfate media for An = Np Pu. Their binding constants measured: log beta(PuO2SO4(-))(0) 1.30 +/- 0.11, beta(PuO2Cl)(1 M NaCl)...
Complexation of trivalent actinides with DTPA (diethylenetriamine pentaacetic acid) was studied as a function pcH and temperature in (Na,H)Cl medium 0.1 M ionic strength. Formation constants both complexes AnHDTPA(-) AnDTPA(2-) (where An stands for Am, Cm, Cf) were determined by TRLFS, CE-ICP-MS, spectrophotometry, solvent extraction. The values formation obtained from the different techniques are coherent consistent reinterpreted literature data, showing higher stability Cf than Am Cm...
Incorporation of 226Ra within gypsum (CaSO4·2H2O(s)) and celestite (SrSO4(s)) was assessed through dedicated batch experiments monitored over hundreds days. Dissolution/recrystallization coprecipitation were carried out to investigate a range chemical conditions, close or far from equilibrium conditions. These data used establish the ability incorporate 226Ra. Celestite shows high incorporation, with partition coefficient around 105. On contrary, is not significantly incorporated into pure...
The luminescence spectra of triscarbonatouranyl complexes were determined by experimental and theoretical methods. Time-resolved laser-induced fluorescence spectroscopy was used to monitor uranyl bicarbonate solutions at 0.1 mol kgw-1 ionic strength pH ca. 8. concentrations Mg2+ Ca2+ in the samples chosen order vary proportions alkaline earth ternary MgUO2(CO3)32-, CaUO2(CO3)32-, Ca2UO2(CO3)3. spectrum each complex decomposition compare it with simulated model structures...
The luminescence properties of the [UO2Cl4]2– complex in an organic phase, especially influence large countercations, have been studied by time-resolved laser-induced fluorescence spectroscopy (TRLFS) and ab initio modeling. experimental spectrum was assigned vibronic Franck–Condon calculations on quantum chemical methods basis a combination relativistic density functional approaches. shape uranyl tetrachloride is determined symmetrical vibrations geometrical change upon emission. possible...
Beta-octafluoro-meso-octamethylcalix[4]pyrrole (1) and beta-decafluoro-meso-decamethylcalix[5]pyrrole (2) were found to extract caesium salts of smaller anions (bromide chloride for 1 nitrate 2) as effectively that iodide into nitrobenzene (NB) thereby overcoming the Hofmeister bias normally observed processes this type.
The electrophoretic mobilities (mu ep,Ln) of twelve lanthanides (not Ce, Pr and Yb) were measured by CE-ICP-MS in 0.15 0.5 mol L(-1) Alk2 CO3 aqueous solutions for Alk+ = Li+, Na+, K+ Cs+. In solutions, two different mu ep,Ln values found the light (La to Nd) heavy (Dy Tm) lanthanides, which suggests stoichiometries carbonate limiting complexes. These results are consistent with a solubility study that attests Ln(CO3)3(3-) Ln(CO3)4(5-) (small) (big) respectively. counterions influence...
The carbonate complexation of curium(III) in aqueous solutions with high ionic strength was investigated below solubility limits the 10−70 °C temperature range using time-resolved laser-induced fluorescence spectroscopy (TRLFS). equilibrium constant, K3, for Cm(CO3)2- + CO32- ⇌ Cm(CO3)33- reaction determined (log K3 = 2.01 ± 0.05 at 25°C, I 3 M (NaClO4)) and compared to scattered previously published values. log value Cm(III) found increase linearly 1/T, reflecting a negligible influence on...