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• W2046750529 abstract "ABSTRACT The atomic concentration available for excitation in atomic absorption (AA) and atomic fluorescence (AF) spectrometry can be increased by maintaining a low concentration of species, such as O, OH, etc., to minimize compound formation and maintaining a fairly low temperature to minimize ionization. An effective means of accomplishing this is to use a graphite furnace (at a temperature of about 2000°K). Such a furnace if flushed with argon provides a nearly ideal environment for atomization of the sample. L'vov has used such a system for AA. More recently Massman, and Woodriff, have described similar systems for AA and have obtained excellent senstivities for elements normally difficult to atomize in flames, e.g. Al and Sn. Massman also used a graphite furnace with hollow cathode discharge tube sources for AF and again obtained good sensitivities for several elements even though his sources were of low intensities. The major difficulties encountered in using graphite cells have been poor reproducibility in sampling and the presence of high background. A theoretical comparison of the graphite cell and the flame cell for analytical spectrometry is given. Also emission, absorption and fluorescence spectrometry are compared with respect to radiance levels. As a result of the theoretical comparison, the optimum method for trace element analysis would seem to be atomic fluorescence with a graphite cell. We are using a unique graphite cell system with both continuum and line sources for excitation. We are modulating the exciting radiation and using either a synchronous photon counting or a lock-in amplifier. The sample solution is introduced into the graphite cell via a hypodermic syringe or via a nebulizer. An argon flush is used to minimize oxidation of the graphite." @default.
• W2046750529 created "2016-06-24" @default.
• W2046750529 creator A5037241082 @default.
• W2046750529 date "1970-01-01" @default.
• W2046750529 modified "2023-09-26" @default.
• W2046750529 title "Non-flame cells in atomic fluorescence spectrometry" @default.
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• W2046750529 doi "https://doi.org/10.1351/pac197023010035" @default.
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