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A silicon-intensified target vidicon tube (SIT) is evaluated for analytical use in the determination of 17 elements in an Ar-separated C2H2/air flame and 5 elements in an Ar-separated C2H2/N2O flame using combined atomic emission and atomic fluorescence as excited by a 150 W CW EIMAC xenon arc lamp. Benefits of combining emission and fluorescence signals in multielement analysis are experimentally shown. Limits of detection are approximately 100 times worse than previously reported by atomic fluorescence alone using a conventional spectrophotometer with the same 150 W EIMAC lamp. Linear dynamic ranges are between ∼10 and ∼100 for elements analyzed in the C2H2/air flame and are as high as 1000 for elements in the C2H2/N2O flame. Little or no use of the SIT and many similar image detectors for multielement analysis via atomic emission and/or atomic fluorescence is predicted at the present “state of the art.”

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Laser-enhanced ionization (LEI) spectrometry using a water-cooled electrode immersed directly in a nitrous oxide-acetylene flame has been examined for the determination of refractory elements. LEI detection limits for refractory elements in aqueous solution are comparable to or better than detection limits obtained by flame atomic absorption, plasma emission, and atomic fluorescence techniques. Only graphite furnace atomic absorption spectrometry exhibits superior detectability for certain refractory elements in aqueous solution over LEI spectrometry using a nitrous oxide-acetylene flame. The successful application of the nitrous oxide-acetylene flame now extends the applicability of LEI spectrometry to include most of the elements in the periodic table which can be determined by other common atomic spectrochemical techniques.