Atomic absorption spectroscopy
In chemistry, Atomic Absorption Spectroscopy (AAS) is used to detect and measure concentrations of a particular metal element within a solution. The scientists atomise the sample (make it turn to individual atoms) and then see what light wavelengths it absorbs. Each type of chemical (element) absorbs a particular wavelength, so scientists can tell which chemicals are in the sample. Every element has a different atomic absorption spectrum because of the different light wavelengths it absorbs.