抄録
A plasma jet excitation source was developed for the spectrochemical analysis of solid metal samples.
Influences of the electrode shape, gases, direct current and additional materials on the intensity-time curves were studied by using a pure iron and a few kinds of steels as samples. Based on the results, the best conditions for determinations of manganese and silicon in carbon steels and of cerium and tungsten in alloy steels were decided respectively.The analytical precision of manganese in a carbon steel was 7.66 percent.
It was observed that the vaporization rate of alloying elements had a relation with the vapor pressure of the elements at high temperatures.The plasma jet flame showed rather lower temperature, approximately 5000°K, compared with the usual arc or spark discharge. Accordingly, this method has such advantages as that the spectrum pattern is simple and the background is relatively low, since spectral lines with high excitation potentials are scarecely excited.
