LIBS Info: Element Analysis
| Title | Authors | Material | Detector | Spectrometer | Software |
|---|---|---|---|---|---|
| Heavy Metals Detection in Zeolites Using the LIBS Method | P. Veis, Pavol Hudec, Michal Hornacek, Jozef Plavcan, Michaela Hornackova | Geological | Andor ICCD | Mechelle 5000 | |
| Laser: | Nd:YAG 532.0000nm 165.0000mJ 10.000Hz |
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| Gate Delay: | 1.000us | ||||
| Gate Width: | 1.000us | ||||
| Zeolite samples were then spiked with solutions of Cu, Co, Cr, Pb and Cd, dried and then pressed into pellets for analysis. The authors used measurements of Electron Density and Plasma temperature to ensure suitable conditions for LIBS. | |||||
| Element | Detection Limit (ppm) | Wavelength (nm) | Other Wavelengths (nm) | Calibration Method | Calibration Range (ppm) | Notes |
|---|---|---|---|---|---|---|
| Cr | 16.4000 (Calibration Curve Slope) | 425.4300 | 301.37nm, 301.52nm, 297.19nm, 312.5nm, 320.92nm | Univariate | -10.0000--10.0000 | Best linearity came from 297.19nm+312.5nm+320.92nm peaks ratioed to Al II 281.62nm, however, lowest LOD came from 425.43nm peak. |
| Co | 18.5000 (Calibration Curve Slope) | 348.9400 | 350.23nm, 350.63nm, 351.26nm, 236.38nm, 239.74nm, 258.22nm, 258.72nm | Univariate | -10.0000--10.0000 | Best R^2 came from ratioed sum of 236.38nm + 239.74nm + 258.22nm + 258.72nm to Ca II 393.37 + Mg II 280.27nm. However, lowest LOD came from 348.94nm peak |
| Pb | 62.6000 (Calibration Curve Slope) | 405.7800 | 283.31nm, 368.34nm | Univariate | -10.0000--10.0000 | Best calibration curve (from R^2) was from sum of intensities of Pb peaks at 283.31nm, 368.34nm and 405.78 nm normalised to Si Peak at 390.55nm. However, best LOD came from using unratioed 405.78nm peak. |
| Cd | 190.7000 (Calibration Curve Slope) | 226.5000 | 508.58nm | Univariate | -10.0000--10.0000 | The best overall calibration curve came from the 508.58nm peak ratioed to the Si peak at 243.52nm. However the best LOD came from the more intense 226.5nm peak |
| Cu | 14.4000 (Calibration Curve Slope) | 324.7500 | 515.32, 521.82 | Univariate | -10.0000--10.0000 | While a calibration curve using the summed intensities of the 515.32nm + 521.82nm peaks gave the best linearity, the slope of the (self absorbed at high concentration)calibration curve from the 324.75nm peak gave the best detection limit. |
| Element | RMSE (ppm) | Wavelength (nm) | Calibration Method | Notes |
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