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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.
The purpose of all AA group meetings, as the Preamble states, is for AA members to âshare their experience, strength and hope with each other that they may solve their common problem and help others to recover from alcoholism.â Toward this end, AA groups have both open and closed meetings.he purpose of all AA group meetings, as the Preamble states, is for AA members to âshare their experience, strength and hope with each other that they may solve their common problem and help others to recover from alcoholism.â Toward this end, AA groups have both open and closed meetings.