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By John Edward Cantle (Eds.)

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Analytical determinations of these high concentrations can be made by using an absorption line with a lower oscillator strength. An example of several lines which can be used is shown in Fig. 3, which shows the absorption trace for copper. I t can be seen that the useful analytical ranges for these lines are very wide. Not all elements have numerous absorption lines available but many do. The wavelengths of these lines and the oscillator strengths and analytical sensitivities are given in a number of books and reviews 112-171.

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. However, this system is now obsolete.

Such a lamp is obviously convenient for the analyst, but there are some limitations to this approach. Some combinations of elements cannot be used because their resonance lines are so close that they interfere with each other. 5 Concentration Ag Mg MI-' Fig. 8. Graph showing absorbance as a function of lamp current. required and the combination is therefore unworkable. Other combinations cannot be used simply because of manufacturing difficulties in trying to incorporate elements of widely differing physical characteristics into a common cathode.

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