LIBS Info: Element Analysis

Title Authors Material Detector Spectrometer Software
Spectroscopic detection of health hazardous contaminants in lipstick using Laser Induced Breakdown Spectroscopy M.A. Gondal, Z.S. Seddigi, M. Nasr, B. Gondal Cosmetics Ocean Optics LIBS2500+ Ocean Optics LIBS2500+
Laser: Nd:YAG
1064.0000nm
135.0000mJ
10.000Hz
Gate Delay: Noneus
Gate Width: Noneus
As the title suggests, LIBS is used to analyse commercially obtained Lipstick for a range of (worrying) elements. Lipstick (which is neither liquid nor solid) provides a range of technical challenges. Samples were prepared by heating to 105C (to remove water), then freezing and cut into 1cm diameter discs. Calibration samples were made by spiking lipstick samples with elements of interest.
Element Detection Limit (ppm) Wavelength (nm) Other Wavelengths (nm) Calibration Method Calibration Range (ppm) Notes
Cd 3.0000 (Calibration Curve Slope) 361.1000 N/A Univariate Calibration -10.0000--10.0000 Paper has 2 sigma/slope, result converted to more usual 3 sigma/slope
Cr 3.4000 (Calibration Curve Slope) 428.9000 N/A Univariate Calibration -10.0000--10.0000 Paper has 2 sigma/slope, result converted to more usual 3 sigma/slope
Zn 3.9000 (Calibration Curve Slope) 334.5000 N/A Univariate Calibration -10.0000--10.0000 Paper has 2 sigma/slope, result converted to more usual 3 sigma/slope
Pb 2.5000 (Calibration Curve Slope) 405.8000 N/A Univariate Calibration -10.0000--10.0000 Paper has 2 sigma/slope, result converted to more usual 3 sigma/slope


Element RMSE (ppm) Wavelength (nm) Calibration Method Notes
Cr 1.2145 ppm 428.9000 Univariate Calibration Comparison method is ICP
Zn 1.8062 ppm 334.5000 Univariate Calibration Reference method is ICP.
Cd 1.0308 ppm 361.1000 Univariate Calibration ICP is reference method
Pb 0.5362 ppm 405.8000 Univariate Calibration Reference method is ICP.