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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.
âThis was a very stark contrast. Both men and women benefit the same from AA, but womenâs exposure and involvement in AA resulted in better coping with anxiety and anger. In men, this was not the case. It was very surprising to me,â says Kelly.oth men and women benefit the same from AA, but womenâs exposure and involvement in AA resulted in better coping with anxiety and anger. In men, this was not the case.