Atomic absorption spectroscopy

(AAS). Light whose frequency spectrum corresponds to the element to be analyzed is sent through the vaporized analysis sample. The latter takes the part of the energy from the light that is typical for this element. The measurable absorbance (attenuation) is proportional to the concentration of the sought element in the atomized solution. The measurement is based on the law that a quantum of light emitted by an excited atom can be absorbed by an unexcited atom of the same element.