Development of on-line analytical method for scrapped materials by using laser-induced plasma atomic emission spectrometry under evacuated atmosphere

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Analytical techniques for rapid quantification for scrapped materials have been proposed by use of laser ablation and/or laser-induced plasmas. For this purpose, we have developed two excitation sources in atomic emission spectrometry : one is a laser-induced plasma source under reduced argon pressures and the other is a laser-ablation source associated with a helium glow discharge plasma. The former could be employed for on-line analysis of scrapped materials, while the latter could be employed for the precise determination of minor elements in scrapped materials. The emission signals from the laser-induced plasma source are easily detected because the background intensity is very small ; it is therefore suitable for the excitation source for on-line analysis. The optimum operation conditions were determined so that the signal-to-background ratio of the emission signals could be maximized. The laser-ablation source with a high-frequency Nd:YAG laser can be employed for the sample introduction to the helium glow discharge plasma, which works as a reliable excitation source because the glow discharge plasma as well as the laser sampling are very stable.