Zhaoxiang Lin

Correction and analysis of lead content in soil by laser-induced breakdown spectroscopy

The laser-induced breakdown spectroscopy is used to analyze the lead content in soils. The analyzed spectral line profile is fitted by Lorentzian function for determining the background and the full-width at half-maximum (FWHM) intensity of spectral line. A self-absorption correction model based on the information of spectral broadening is introduced to calculate the true value of spectral line intensity, which refers to the elemental concentration. The results show that the background intensity obtained by spectral profile fitting is very effective and important due to removing the interference of spectral broadening, and a better precision of calibration analysis is acquired by correcting the self-absorption effect.

Determination of metals in liquid by laser-induced breakdown spectroscopy

This paper reports studies on metals in the liquid by laser-induced breakdown spectroscopy in order to detection of heavy metals in industrial wastewater. A measuring device by LIBS has been established which including the Nd:YAG laser, Echelle spectrograph, intensified charge-coupled device (ICCD) and liquid jet. The characteristic spectral lines of twelve metals in actual industrial wastewater from a certain nonferrous metals company were analyzed using LIBS. The calibration curves of the metals in liquid were acquired by the experiment and the linear correlation coefficients were high. The detection limits of metals obtained from the liquid were low, especially for the Ca, Cu, K, Mg, Mn and Na. The results show that the measuring system can be applied in the on-line, rapid detection of heavy metals in industrial wastewater, and it has wide range of applications.