|Use:||Analyzing heavy metals.|
Atomic absorption (AA) spectroscopy involves the absorption of radiant energy by neutral atoms in the gaseous state. Since samples are usually liquids or solids, the analyte atoms or ions must be vaporized in a flame or graphite furnace. The atoms absorb ultraviolet or visible light and make transitions to higher electronic energy levels. The analyte concentration is determined from the amount of absorption.
All AA spectroscopy instruments have the following basic features:
More sophisticated instruments can have more than one channel for simultaneous determination of more than one element. Multi-element sequential instruments can be programmed to automatically determine chosen elements sequentially.
|Requires extraction to liquid phase||Requires extraction||BETTER|
|Selectivity:||Technique measures the contaminant directly.|
|Susceptibility to Interference:||Low.|
|Detection Limits :||100-1000 ppb (soil); 1-50 ppb (water).|
|Turnaround Time per Sample:||More than a day.|
|E 1727 - 95||Field Collection of Soil Samples for Lead Determination by Atomic Spectrometry Techniques.|
|7000A||Atomic Absorption Methods (RCRA).|
|Series 7000||47 Methods for Specific Analytes.|
|200.0||Atomic Absorption Methods (Drinking Water).|
|Series 200||63 Methods for Specific Analytes and Techniques.|
|Previous Page||Sample Access/Collection Matrix||Sample Analysis Matrix||Home||Areas of Interest||Next Page|