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1 Atomic absorption spectroscopy (AAS) : A technique used to identify the presence and concentration of substances by analysing the spectrum produced when a substance is vaporised and absorbs certain frequencies of light.2  AAS is used particularly for detecting the concentrations of metal ions in solutions. Atomic absorption spectroscopy (AAS) : A technique used to identify the presence and concentration of substances by analysing the spectrum produced when a substance is vaporised and absorbs certain frequencies of light.
How Do Antigens and Antibodies Work: The Immune Response. To better understand the difference between antigen and antibody, it helps to become familiar with the immune response. All healthy adults have thousands of various antibodies in small amounts throughout their body.