Atomic-absorption spectroscopy (AAS) is used to measure the concentration of an element in a sample. There are two main types of instruments: flame AA and graphite-furnace AA. The flame AA provides high precision analyses of aqueous solutions. The graphite-furnace AA provides greater sensitivity and can directly analyze solid samples but it has lower precision than flame AA. In general AA spectrometers can analyze only one or a few elements simultaneously.
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/chem-ed/courses/spec/atomic/aa.htm, updated 9/29/96
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