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In atomic absorption spectroscopy why is the monochromator located after the sample compartment (the flame) rather...

In atomic absorption spectroscopy why is the monochromator located after the sample compartment (the flame) rather than before as in the case of a scanning UV-Visible absorption spectrophotometer?

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Answer #1

A monochromator is used to disperse the various wavelengths of light (which are emitted from the source and flame) and to isolate the particular line of interest. The selection of a specific source and a particular wavelength in that source is what allows the determination of a selected element to be made in the presence of others. While in the case of a scanning UV-Visible absorption spectrophotometer the monochromator only needs to disperse the wavelengths of light from the sourde and to isolate the particular line of interest.

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