Explain the principle of standard addition method for quantitative det

Question

Explain the principle of standard addition method for quantitative determinations using atomic absorption spectrometry. Under what conditions this methodology does becomes important?

26 Apr 2023

Answer :

Word Count : 643

Atomic absorption spectrometry (AAS) is a powerful analytical technique used to determine the concentration of metal ions in a sample. The principle of AAS involves the absorption of light by the ground-state atoms in the gas phase, which leads to the excitation of the atoms to higher energy levels. The amount of light absorbed is directly proportional to the number of ground-state atoms in the sample, which in turn is proportional to the concentration of the metal ion being measured.

One common problem encountered in AAS is the presence of matrix interference. Matrix interference refers to the effect of other compounds in the sample on the absorption of light by the metal ion being measured. These compounds can either enhance or reduce the absorption of light, leading to inaccurate measurements of the metal ion concentration.

The standard addition method is a technique used to overcome matrix interference in AAS. The principle of the standard addition method is based on the ______ ___ ____ _____ __________.
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