Determination of tungsten by plasma emission spectrometry.
The emission spectrum of tungsten in an inductively coupled Ar/Ar-plasma (ICP) was investigated and relative intensities of 17 lines listed. Among the lines tested, W I 400.875 nm and W 207.911 nm are recommended for steel analysis. Several others suffer from severe spectral interferences. The line W 400.875 nm is very sensitive, but interfered with by titanium and very high iron concentrations. The line W 207.911 nm requires careful determination of adjacent background, but can be used even with low-resolution instruments. The influence of RF power, nebulizing conditions, burner height, and acid concentration was tested and found to be small enough for simple control in routine work. Steels and other alloys containing 0.02-80% W were analysed.
Wünsch
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Anorganisch-chemisches Institut der Universität, D-4400 Münster, Federal Republic of Germany.