Features of AAS:

• GFAAS needs an extremely small sample size and does not need any sample preparation; even solid samples can be analysed without dissolution.
• The background absorption effects in GFAAS are managed by diluting the sample or selecting another resonance wavelength line. In matrix modifier method a reagent is added to the sample that may modify the matrix behaviour and thereby tackle the problem of background.
• Accuracy in AAS method is generally of the order of 0.5 - 5%; the precision being 0.3 - 1% at absorbance larger than 0.1 or 0.2 for flame atomisation and 1 - 5% with electrothermal atomisation.
• It is a robust technique that employs easy to use equipment and can achieve good detection limits. As the turnaround time is small the cost of analysis per sample is not much. However, lack of automation, and usage of flammable gases are not desirable.