By John Edward Cantle (Eds.)
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Additional info for Atomic Absorption Spectrometry
J. V. Sullivan and A. Waish, Spectrochim. Acta, 21 (1965)721. B. J. Russel and A. Walsh, Spectrochim. Acta, 15 (1959)883. C. Candler, Atomic Spectra, D. , 1964. H. Kahn, At. Absorpt. , 7 (1968)40. A. Menzies, Anal. , 32 (1960)898. J. W. Robinson, Anal. , 33 (1961)1226. T. Hadeishi and R. D. McLaughlin, Science, 174 (1971)404. J. W. Robinson, Atomic Absorption Spectroscopy, M. , 1975. G. F. Kirkbright, Atomic Absorption and Fluorescence Spectroscopy, M. Sargent, Academic Press, London, 1974. A. A.
A. 15 Chapter 2 Instrumental requirements and opthisation J. E. , Ion Path, Road 3, Winsford, Cheshire CW7 3BX (G t. Britain) 1. INTRODUCTION The general construction of an atomic absorption spectrometer, which need not be at all complicated, is shown schematically in Fig. 1. The most important components are the light source (A), which emits the characteristic narrow-line spectrum of the element of interest; an ‘absorption cell’ or ‘atom reservoir’ in which the atoms of the sample to be analysed are formed by thermal molecular dissociation, most commonly by a f l e e (B); a monochromator (C) for the spectral dispersion of the light into its component wavelengths with an exit slit of variable width to permit selection and isolation of the analytical wavelength; a photomultiplier detector (D) whose function it is to convert photons of light into an electrical signal which may be amplified (E) and eventually displayed to the operator on the instruments readout, (F).
Because quartz glass transmits over the full wavelength range it is suitable for all lamps. The other glasses are less expensive, and they can be used for elements whose resonance lines lie above 300 nm. e. about 1/50th of atmospheric pressure. Neon is preferred because it produces a higher signal intensity than argon, but where a neon line occurs in close proximity to the element’s resonance line, argon is used instead. Hollow-cathode lamps are not, of course, the only light source capable 27 of producing the line spectra of chemical elements, but they are the most universally accepted source for atomic absorption instruments.