LIBS Info: Element Analysis

Title Authors Material Detector Spectrometer Software
Quantitative Determination of Manganese in Aqueous Solutions and Seawater by Laser-Induced Breakdown Spectroscopy (LIBS) Using Paper Substrates [Echelle] Junshan Xiu, Shilei Zhong, Huaming Hou, Yuan Lu, Ronger Zheng Liquids Andor ICCD Mechelle 5000
Laser: Nd:YAG
Gate Delay: 1.200us
Gate Width: 4.000us
Whatman 42 filter papers were used as the substrate to the absorb the liquid prior to analysis. The paper was dipped into the sample, then allowed to rest on the analysis surface for several minutes prior to analysis. Samples were not dried. It was also found that 2 layers of filter paper worked better as it prevented laser breakthrough to the metal plate under the samples. This describes the results using a Czerny Turner spectrometer, then next paper describes the results using an echelle spectrometer. While the detection limits for the echelle were higher than the Czerny Turner, the compact size of the echelle and wide spectral range could provide advantages for field deployment. Higher LODs were also found for mixed (ie. not just the element of interest in solution) vs pure samples.
Element Detection Limit (ppm) Wavelength (nm) Other Wavelengths (nm) Calibration Method Calibration Range (ppm) Notes
Mn 2.3300 (Calibration Curve Slope) 257.6100 N/A Univariate -10.0000--10.0000 LOD in Mixture solution: 2.87ppm, LOD in seawater: 2.73ppm
Cu 1.6700 (Calibration Curve Slope) 324.7000 N/A Univariate -10.0000--10.0000 LOD in mixture: 2.13ppm
Cd 5.3200 (Calibration Curve Slope) 226.5000 N/A Univariate -10.0000--10.0000 LOD in mixture: 6.56. Ratio to H(alpha) peak for better performance
Cr 3.9800 (Calibration Curve Slope) 360.5300 N/A Univariate -10.0000--10.0000 (Surprisingly) LOD in pure was higher: 4.74ppm. Ratio to H(alpha) peak for better performance

Element RMSE (ppm) Wavelength (nm) Calibration Method Notes