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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 Automated Export System (AES) is the system used by U.S. exporters to electronically declare their international exports, known as Electronic Export Information (EEI), to the Census Bureau to help compile U.S. export and trade statistics.The export process begins when the exporter decides to export merchandise.he Automated Export System (AES) is the system used by U.S. exporters to electronically declare their international exports, known as Electronic Export Information (EEI), to the Census Bureau to help compile U.S. export and trade statistics. The export process begins when the exporter decides to export merchandise.