Quantitative Analysis of Additives in Solid Zinc Alloys by Laser-induced Plasma Spectrometry

Abstract

In this paper the use of laser-induced plasma spectrometry (LIPS) for the quantitative analysis of Al, Cu, Fe, Pb and Sn components in solid zinc alloys is evaluated. Laser-induced plasmas are characterized using spectroscopic diagnostic techniques that yield the excitation temperature and electron density. Optimal experimental conditions for analysis are evaluated, including time gating parameters and distance from focusing lens to target where it is found that the focus of the laser beam should be positioned behind the target in order to prevent secondary air plasmas from forming in front of the target. Calibration curves are produced for several analytical lines, and the analytical performance of the technique is assessed. While low detection limits (<60 ppm) are found, the precision of measurement could be improved.