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 |
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| 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. |