LIBS Info: Element Analysis

Title Authors Material Detector Spectrometer Software
Development of a method for automated quantitative analysis of ores using LIBS S. Rosenwasser, G. Asimellis, B. Bromley, R. Hazlett, J. Martin, T. Pearce, A. Zigler Mineral Ore Tracer 2100 Tracer 2100
Laser: Nd:YAG
Gate Delay: Noneus
Gate Width: Noneus
Mineral Ore samples were mixed, then hand ground, then pressed at 18000psi for one minute to form pellets for analyis. Some of the samples were also oven dried for 15-20 minutes, although this produced little loss in mass (<0.04g). Drying, however, did seem to improve the measurement RSD. Details on calibration conditions for P, Ca, Al, Mg and Si are all described (but no LODs!). Results show good comparison to ICP results on NIST standard samples
Element Detection Limit (ppm) Wavelength (nm) Other Wavelengths (nm) Calibration Method Calibration Range (ppm) Notes
P 1600.0000 (Minimum concentration detected) 255.3200 253.56 Univariate Calibration -10.0000--10.0000 Despite the 253.56nm peak being stronger, the 255.32nm one was chosen as it was more linear at P2O5 concentrations below 15%. Non linearity (on 253nm peak) seems to have come from Ca interference

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