By John Edward Cantle (Eds.)
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Extra resources for Atomic Absorption Spectrometry
2. Two basic types of flame atomising systems have been used for atomic absorption. Firstly, the total consumption or turbulent burner system in which the total sample aerosol in the oxidant stream and the fuel gas are fed separately through concentric tubes t o the burner jet, where the flame is burned. Considerable turbulence, both optical and acoustic, takes place. On the positive side these burner systems are very simple in construction and thus were cheap to manufacture, did not flash-back and could handle virtually any mixture of gases.
The recommended procedure for correct burner positioning is to insert a white card into the light path prior to flame ignition in order to identify the source light path. The burner position can then be quickly adjusted such that the slot is a few millimeters squarely below the hollow cathode lamp beam. Final burner position optimisation must be done with the flame lit and whilst aspirating an appropriate standard solution. Once again, a fairly responsive instrument display is maximised by moving the burner head in the available planes, paying particular attention to the lateral adjustment for obvious reasons.
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).