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.

LOD
RMSEP

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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
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
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

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

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