Chemistry 2272F Study Guide - Final Guide: Doppler Broadening, Atomic Absorption Spectroscopy, Nebulizer
9 Feb 2018
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Document Summary
What aas is based on; what is analyte, in what physical state: aas is the measurement of the absorption of optical radiation by atoms in the gaseous state. Three forms are based on absorption, emission, and fluorescence. The analyte is the solution being analyzed, is almost always in liquid state and then aspirated into a flame where it is converted into gaseous atoms. Aas has the ability to distinguish one element from another in a complex sample, is highly sensitive, and allows for the ability to perform simultaneous multi-element analyses. Sample introduction, nebulization, atomization: sample solution is drawn into the pneumatic nebulizer by the rapid flow of oxidant (usually air) past the tip of the sam- ple capillary. Liquid breaks into a fine mist as it leaves the capillary. The spray is directed against a glass bead, upon which the droplets break into smaller particles. The formation of small droplets is termed nebulization.
