High-Energy Resolution Fluorescence Detected X-Ray Absorption Spectroscopy: A Powerful New Structural Tool in Environmental Biogeochemistry Sciences - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Environmental Quality Année : 2017

High-Energy Resolution Fluorescence Detected X-Ray Absorption Spectroscopy: A Powerful New Structural Tool in Environmental Biogeochemistry Sciences

Denis Testemale

Résumé

The study of the speciation of highly diluted elements by X-ray absorption spectroscopy (XAS) is extremely challenging, especially in environmental biogeochemistry sciences. Here we present an innovative synchrotron spectroscopy technique: high-energy resolution fluorescence detected XAS (HERFD-XAS). With this approach, measurement of the XAS signal in fluorescence mode using a crystal analyzer spectrometer with a ~1-eV energy resolution helps to overcome restrictions on sample concentrations that can be typically measured with a solid-state detector. We briefly describe the method, from both an instrumental and spectroscopic point of view, and emphasize the effects of energy resolution on the XAS measurements. We then illustrate the positive impact of this technique in terms of detection limit with two examples dealing with Ce in ecologically relevant organisms and with Hg species in natural environments. The sharp and well-marked features of the HERFD–X-ray absorption near-edge structure spectra obtained enable us to determine unambiguously and with greater precision the speciation of the probed elements. This is a major technological advance, with strong benefits for the study of highly diluted elements using XAS. It also opens new possibilities to explore the speciation of a target chemical element at natural concentration levels, which is critical in the fields of environmental and biogeochemistry sciences.
Fichier principal
Vignette du fichier
jeq-2017-01-0023-srm.ece.pdf (673.09 Ko) Télécharger le fichier
jeq-2017-01-0023_SI.pdf (987.64 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01520692 , version 1 (10-05-2017)

Identifiants

Citer

Olivier Proux, Eric Lahera, William F Net, Isabelle F Kieffer, Mauro F Rovezzi, et al.. High-Energy Resolution Fluorescence Detected X-Ray Absorption Spectroscopy: A Powerful New Structural Tool in Environmental Biogeochemistry Sciences. Journal of Environmental Quality, 2017, Synchrotron radiation-based methods for environmental biogeochemistry, 46 (6), pp.1146-1157. ⟨10.2134/jeq2017.01.0023⟩. ⟨hal-01520692⟩
970 Consultations
2262 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More