Top topic this week
Back to FAQs
Related FAQs
Frequently Asked Question
Questions asked by users might not always be phrased in the clearest way.
Explain the interference observed in AAS
Accepted Answer
Interferences in atomic absorption spectrometry (AAS) can arise from various sources, including:
- Spectral interferences: These occur when the analyte and an interfering substance absorb light at the same wavelength. This can lead to an overestimation of the analyte concentration.
- Chemical interferences: These occur when the analyte reacts with an interfering substance to form a new compound that does not absorb light at the desired wavelength. This can lead to an underestimation of the analyte concentration.
- Ionization interferences: These occur when the analyte is ionized in the flame, which can lead to a decrease in the absorption signal. This can be overcome by adding a releasing agent to the sample.
- Matrix effects: These occur when the composition of the sample matrix affects the absorption signal of the analyte. This can be overcome by using a matrix modifier or by matching the matrix of the standards to the matrix of the samples.
Interferences can be a significant source of error in AAS, so it is important to be aware of the potential sources of interference and to take steps to minimize their effects.
Articles you might like