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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 does epos works? EPOS is a system used in sales environment (stores, supermarkets etc) that is a combination of computer and till. Using a database application the front end (the section â¦ normally seen by a customer ) can have product information entered by manual or bar-code entry, the application identifies the product and prices and adds to a sale.