1985 年 26 巻 12 号 p. 901-909
The direct analysis of solid metal samples by inductively coupled plasma emission spectrometry has been investigated. An aerosol generator (AG) by a low voltage spark discharge was used for vaporization of metal samples, and the aerosol was introduced into the plasma through an aerosol cyclone. The effect of the length of a transporting tube (stainless steel) was examined. The lengths investigated were 1, 3, 5, 7.5 and 10 m. The spectral intensities lowered, the amounts of aerosol transferred into plasma decreased, and the relative standard deviation of spectral intensities became worse with the increase of the length. In the determination of Co, Cr and V, no phenomenon of selective adhesion to the inner surface of a transporting tube was observed. In the case of tungsten, there was selective adhesion to the inner surface of the tube and selective removal in the aerosol cyclone. However, in the practical analysis there was no problem, since the standard reference materials for calibration were affected in the same way as the samples for analysis were. This method was compared with the low voltage spark emission spectrometric analysis. In the present method, there were no interfering elements, while in the latter several major elements showed spectral interferences, and in the case of preparation of calibration curves for V and W, there were some standard reference materials which were not fit for making the calibration curves. The direct ICP emission spectral method gave excellent straight calibration lines for all the elements such as Mo, W, Co, Si, Mn, Cr, V and Cu under investigation, and showed better accuracy and precision.
