Comparison between the distributions of excitation temperatures and the analytical line intensities of noble metals in two-jet arc plasmatrons used in atomic emission analysis

摘要

The results of a study of DGP-50 and new EDP-355 argon two-jet plasmatrons, which are used in the atomic emission analysis of geological samples, are reported. The distributions of temperatures and the analytical line intensities of noble metals with torch height were measured for either of the plasmatrons. It was found that the temperature reached in the EDP-355 plasmatron was higher than that in the DGP-50 plasmatron at equal flow rates of a plasma-forming gas. A decrease in the flow rate of a plasma-forming gas in the EDP-355 plasmatron resulted in an increase in the analytical lines of noble metals by a factor of 1.5-2. It was found experimentally that the EDP-355 plasmatron is a promising source for emission spectral analysis in the determination of noble metals.