synchrotron; X-rays; spectroscopy; mercury; speciation; metals;

Ligne de lumière microfocus et très haute dilution à l'ESRF pour les sciences de l'environnement

Equipements d'excellence (EQPX)

Equipements d'excellence

Informations générales

Référence projet : 10-EQPX-0027
Etablissement Coordinateur : Université Grenoble Alpes
Région du projet : Auvergne-Rhône-Alpes
Discipline : 3 - STUE

Aide de l'ANR 4 195 680 euros
Investissement couvrant la période de février 2011 à décembre 2020

Résumé de soumission

The EcoX Equipex is a consortium project managed by the Institute of Earth Sciences (ISTerre) from the University Grenoble Alpes to advance speciation studies of metal(loid)s in the chemical, life and environmental sciences using X?ray emission spectroscopy (XES) through the development of high luminosity analyser crystals at the European Synchrotron Radiation Facility (ESRF). Detection of X-ray fluorescence lines with analyser crystals has provided one of the cornerstones of modern X-ray absorption spectroscopy. However, to date all X-ray emission spectrometers use analyser crystals with a bending radius of R=1 m covering a solid angle lower than 0.1% of the whole emitted fluorescence signal. The instrumental shift at the heart of EcoX is the manufacturing of high luminosity analyser crystals with a bending radius of R=0.5 m to realize the promise to reach, and even surpass, the mytic 1 ng/mg (ppm) detection limit heretofore impossible with R=1 m crystals, and establish XES at ultra-high dilution.

Five Si(111) crystals of R=0.5 m bending radius were manufactured by the ESRF in 2015 and other sets of crystals are now produced in a highly efficient and reproducible manner to satisfy the demand. At the same time, EcoX initiated the construction of three X-ray emission spectrometers.

1- The FAME-UHD beamline on the BM16 X-ray source (5-25 keV). FAME-UHD is a Collaborative Research Group (CRG) beamline integrated into the French CRGs programme jointly managed by the CNRS and CEA. This new synchrotron beamline is now operational and hosts independent investigators since January 2017.

2- A tender X-ray spectrometer (1.5 – 5 keV) on the existing ID26 beamline. It will be commissioned in the fall of 2017.

3- A mobile micro spectrometer (2-25 keV) housed on the existing BM23 beamline. It will be commissioned in the summer of 2017.

On going research studies target neurotoxic mercury in environmental matter and living systems with an unprecedented detection limit of 0.5 ppm.

L'auteur de ce résumé est le coordinateur du projet, qui est responsable du contenu de ce résumé. L'ANR décline par conséquent toute responsabilité quant à son contenu.

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