Standardless Quantification of Heavy Elements by Electron Probe Microanalysis

Aurelien Moy (1) , Claude Merlet (2) , Olivier Dugne (1)

1 CEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire)
2 Géosciences Montpellier

Absolute Mα and Mβ X-ray intensities were measured for the elements Pt, Au, Pb, U, and Th by electron impact for energies ranging from 6 to 38 keV. Experimental data were obtained by measuring the X-ray intensity emitted from bulk samples with an electron microprobe using high-resolution wavelength-dispersive spectrometers. Recorded X-ray intensities were converted into absolute X-ray yields by evaluation of the detector efficiency and then compared with X-ray intensities calculated by means of Monte Carlo simulations. Simulated Mα and Mβ X-ray intensities were found to be in good agreement with the measurements, allowing their use in standardless quantification methods. A procedure and a software program were developed to accurately obtain virtual standard values. Standardless quantifications of Pb and U were tested on standards of PbS, PbTe, PbCl2, vanadinite, and UO2.

Domaines: Chimie analytique

Aurelien Moy, Claude Merlet, Olivier Dugne. Standardless Quantification of Heavy Elements by Electron Probe Microanalysis. Analytical Chemistry, 2015, 87 (15), pp.7779-7786. ⟨10.1021/acs.analchem.5b01443⟩. ⟨hal-01217495⟩