Spectra emission from multielement

Figure 7. (a) Emission spectrum from Li hollow cathode lamp [entrance slit 29] (b) Emission spectrum from multielement hollow cathode lamp containing Cr and Mn [entrance slit 10] (c) Composite spectrum obtained by plugging fiber-optic strands into entrance slits 10 and 29 simultaneously. 

In Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES), a gaseous, solid (as fine particles), or liquid (as an aerosol) sample is directed into the center of a gaseous plasma. The sample is vaporized, atomized, and partially ionized in the plasma. Atoms and ions are excited and emit light at characteristic wavelengths in the ultraviolet or visible region of the spectrum. The emission line intensities are proportional to the concentration of each element in the sample. A grating spectrometer is used for either simultaneous or sequential multielement analysis. The concentration of each element is determined from measured intensities via calibration with standards. 

FIGURE 9-14. Multielement flame emission spectrum from 3886 to 4086 A. [From K. W. Busch, N. G. Howell, and G. H. Morrison, The Vidicon Tube as a Detector for Multielement Flame Spectrometric Analysis, Anal. Chem., 46, 575 (1974). Used by permission of the American Chemical Society.]... 

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