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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 Depressants Work. All depressants work by slowing down the functioning of the central nervous system. This is usually done by enhancing the effect of a type of neurotransmitter called GABA. This is an inhibitory neurotransmitter which means that its job is to calm down operations within the CNS.ow Depressants Work. All depressants work by slowing down the functioning of the central nervous system. This is usually done by enhancing the effect of a type of neurotransmitter called GABA. This is an inhibitory neurotransmitter which means that its job is to calm down operations within the CNS.