LIBS Info: Element Analysis
| Title | Authors | Material | Detector | Spectrometer | Software |
|---|---|---|---|---|---|
| Analysis of gold in rock samples using laser-induced breakdown spectroscopy: Matrix and heterogeneity effects | Blandine Nguegang Kamwa, Maryline Castello, Konstantinos Fytas, Paul Bouchard, Alain Blouin, M. Sabsabi, Francois Vidal, Marc Constantin, Marcel Laflamme, Kheireddine Rifai | Geological | Andor ICCD | Czerny-Turner (Unspecified) | |
| Laser: | Nd:YAG 1064.0000nm 60.0000mJ 10.000Hz |
||||
| Gate Delay: | 2.000us | ||||
| Gate Width: | 10.000us | ||||
| LIBS analysis of rock powders and drill cores [the key resources of any geological analysis] for Gold (Au) content. For calibration curves, 44 pressed powder samples are used in the range 0-1000ppm. The authors use a PCA based classification scheme that enabled different normalisation schemes to be applied to different mineralogies [Si vs Fe rich]. This calibration curve was then tested on drill core samples. | |||||
| Element | Detection Limit (ppm) | Wavelength (nm) | Other Wavelengths (nm) | Calibration Method | Calibration Range (ppm) | Notes |
|---|---|---|---|---|---|---|
| Au | 1.5000 (Calibration Curve Slope) | 267.5900 | N/A | Univariate | 0.0000-932.0000 | PCA used to determine if sample high in Si or Fe. This is the LOD for high Fe samples (due to interference from Fe lines neighbouring Au line). Key to the determination was analysis on a blank (no Au) sample. |
| Au | 0.7500 (Calibration Curve Slope) | 267.5900 | N/A | Univariate | 0.2800-891.0000 | From Pressed powder samples with high Si, low Fe concentrations. |
| Element | RMSE (ppm) | Wavelength (nm) | Calibration Method | Notes |
|---|---|---|---|---|
| Au | 3.5372 ppm | 267.5900 | Univariate Calibration | A univariate calibration, with initial PCA step (to separate Si rich from Fe rich samples). . . . . . . . |