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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 It Works. 1  All funds are deposited into a central operating account. 2  Subsidiary accounts to handle payroll, petty cash or other similar needs always maintain a zero balance. 3  Each day, the total for all checks presented against each ZBA is offset by a debit to the central operating account.