AAS stands for Atomic Absorption Spectroscopy, which is a spectroanalytical procedure used to determine the concentration of chemical elements by free atoms in the gaseous state. AAS is based on the absorption of light by free metallic ions and can be used to determine over 70 different elements in solution or directly in solid samples via electrothermal vaporization. AAS is used in various fields such as pharmacology, biophysics, archaeology, and toxicology research. AAS can be used to determine metallic elements in environmental, pharmaceutical, chemical, petrochemical, and food and beverage applications. There are different types of AAS, such as flame (FAAS), graphite furnace (GFAAS), or hydride generation AA (HGAAS), depending on the application.

It is important to note that AAS can also refer to an Associate of Applied Science degree, which is a two-year associate-level college degree with a focus on a particular applied science or technical skill. This degree is designed for students who want to become part of the workforce immediately after attending school and is not intended for students who want to continue their education in a bachelors degree completion program. Graduates who hold an AAS degree can pursue a wide range of positions in various fields, such as dental hygienist, web developer, or chemical technician.