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
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