18-8: What is an absorption spectrum?

Atomic Absorption spectroscopy (AAS) is based upon the principle that free atoms in the ground state can absorb light of a certain wavelength. Absorption for each element is specific, no other elements absorb this wavelength

The pattern of absorption lines in a spectrum is diagnostic of the types of atoms and molecules present, for example, in the surface layers of a star or the atmosphere of a planet. Absorption lines are seen in the spectra of the Sun and other stars.

Agriculture– analyzing soil and plants for minerals necessary for growth

Environmental Study– determination of heavy metals in water, soil, and air

Food Industry– quality assurance and testing for contamination

Forensic’s – substance identification

Mining– testing the concentration of valuable substances in potential mining areas

Nuclear Energy– monitoring potentially hazardous elements in water and waste output

Petrochemical– analyzing products for metals and other substances that can have adverse affects such as oil and gas

Pharmaceutical– many applications from quality control to detecting impurities in drugs