A New Strategy for Multi-Element Quantification in Oxide Materials
A study introduces a chemically constrained, two-step Calibration-Free Laser-Induced Breakdown Spectroscopy (CF-LIBS) strategy for multi-element quantification in oxide materials. The published paper is entitled, “A chemically constrained two-step calibration-free LIBS strategy for multi-element quantification in oxide materials.”
The research resolves a long-standing analytical trade-off in CF-LIBS: Balancing the high-density plasma conditions required for thermodynamic modelling with the high signal-to-background ratios needed to detect trace elements. Central to this work was the spectral acquisition framework provided by LTB Lasertechnik Berlin. The team utilized the LTB CORALIS, equipped with an Aryelle Butterfly echelle spectrometer, delivering high optical resolving power across the 190 to 800 nm range. This hardware configuration was essential for resolving complex atomic and ionic emission lines, enabling accurate temperature and density determinations, while maintaining optimum optical parameters to detect trace elements.
The experimental and theoretical framework integrates four key analytical techniques:
- Time-Resolved Optical Emission Spectroscopy
- Plasma Diagnostics
- Chemically Constrained Reconstruction
- Scanning Electron Microscopy (SEM)
The methodology was validated on high-purity silica extracted from Algerian shell flour and river sand. It achieved simultaneous quantification of major matrix constituents (Si, O), light elements (H, C), and trace impurities (Na, Al, Fe, Ca, Mg, K, Ti, Sr, Ba) without external calibration standards. This approach offers a robust framework for expanding the accuracy and quantitative scope of LIBS in complex material characterization.
Some of the paper’s highlights are:
- A two-step calibration-free LIBS methodology combining early- and late-delay spectral acquisition
- Chemically constrained oxide reconstruction ensures mass balance and compositional consistency
- Simultaneous quantification of major, light, minor, and trace elements without external calibration
- Successful validation of high-purity silica derived from diatomite and natural sand
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