LIBS Info: Element Analysis

Title Authors Material Detector Spectrometer Software
Determination of chloride content in concrete structures with laser-induced breakdown spectroscopy G. Wilsch, F. Weritz, D. Schaurich, H. Wiggenhauser Concrete or Cement Acton Spectra Pro Acton Spectra Pro
Laser: Nd:YAG
Gate Delay: Noneus
Gate Width: 8600.000us
Cement samples, mixed with known amounts of NaCl, then set were used for calibrations. Initial measurements in Air did not come close to the necessary detection limits, so He atmosphere was tried. Test measurements were then performed on concrete cores. A technique involving the ratio of the Ca line at 849.9nm to the O line at 844.6nm was used to differentiate cement/mortar signal from aggregate (which has no Cl). Depth profiling of Concrete samples was also performed,
Element Detection Limit (ppm) Wavelength (nm) Other Wavelengths (nm) Calibration Method Calibration Range (ppm) Notes
Cl 1500.0000 (Stated) 837.5940 N/A Univariate Calibration -10.0000--10.0000 Ratioed to C at 833.5nm for better results. He atmosphere

Element RMSE (ppm) Wavelength (nm) Calibration Method Notes