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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.
Alpha-1 occurs when there is a lack of a protein in the blood called alpha-1 antitrypsin, or AAT. AAT, the alpha-1 protein, is mainly produced by the liver. The main function of AAT is to protect the lungs from inflammation caused by infection and inhaled irritants such as tobacco smoke.The low level of AAT in the blood occurs because the AAT is abnormal and cannot be released from the liver at the normal rate.lpha-1 may result in serious lung disease in adults and/or liver disease at any age. For each trait a person inherits, there are usually two genes; one gene comes from each parent. People with Alpha-1 have received two abnormal alpha-1 antitrypsin genes.