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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 work of an anesthesiologist assistant (or AA) directly contributes to the success of surgical operations by ensuring the comfort and wellbeing of the patient. AAs perform their duties under the direct supervision and discretion of the supervising medical anesthesiologist.