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The technique of flame atomic absorption works as follows:

 

  1. The liquid sample is drawn through a capillary tube and led to a nebulizer where this disintegrates and form spray or liquid droplets.
  2. The drops formed are led to a flame, where a series of events leading to the formation of atoms occurs. These atoms qualitatively absorb radiation emitted by the lamp and the amount of radiation absorbed is a function of its concentration. 
  3. Lamp signal after passing through the flame reaches a monochromator, which is intended to discriminate all the signs that accompany the line of interest.
  4. This electromagnetic radiation signal reaches a detector or transducer and passed to an amplifier and finally to a reading system in which you can know the composition of each element forming the sample.