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Chemistry LibreTexts

Atomic Absorption

AA Schematic info:

  1. Be able to relate the differences between atomic absorption and atomic emission with respect to the transition that is observed. This includes why limits of detection are better in an analysis for some metals with a particular method (such as FAA vs. FAE, for example) as opposed to others.

  2. Be able to relate specifically why graphite furnace (electrothermal vaporization) AA has a much higher sensitivity than flame AA.

  3. Understand source modulation; be able to relate why there tends to be improved LODs using source modulation as opposed to not using source modulation.

  4. Be able to acquire and process data from an analysis. This includes obtaining a signal for a blank, standards, and unknown; taking into account how the sample was processed (sample blank), which includes dilutions of both the sample & standards; plot the data (Absorbance vs. Concentration) & obtain a calibration curve; calculating a limit of detection for the analyte. – sample problems in part 9.