Several spectrochemical measurement systems have been used for the characterization of near-IR emission spectra from the inductively coupled plasma, with particular emphasis on the determination of sulphur. Background emission spectra of Ar and N<sub>2</sub>/Ar ICPs and the emission spectrum of dimethylsulphoxide (DMSO) are presented and the major emission lines of Ar, N, C, O and S are tabulated. These measurements and data cover the spectral region from about 3 μm to 0.7 μm and were obtained using a Fourier transform spectrometer. Detection limits for the determination of sulfur using a monochromator in combination with either a Si photodiode, a Si photodiode array or a PbS detector at the 0.922 and 1.046 μm lines are presented. The best detection limit (20 ppm) was obtained with the Si photodiode detector at the 0.922 μm line.
E. A. Stubley and G. Horlick, "Some Near-IR Spectral Emission Characteristics of the Inductively Coupled Plasma," Appl. Spectrosc. 38, 162-168 (1984)
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