Question

In AAS, ionization of analyte atoms in flame/plasma can be suppressed by:

• A. \( \text{EDTA or other complexing agents} \)
• B. \( \text{Addition of KCl to the matrix} \)
• C. \( \text{Addition of oxyanions such as sulfate or phosphate} \)
• D. \( \text{Internal standards methods} \)

Hint:

Ionization suppression enhances analyte detection by maintaining stable atomic absorption conditions.

Answer 1

The Correct Option is B

In Atomic Absorption Spectroscopy (AAS), ionization suppression is crucial for accurate metal analysis. Adding potassium chloride (KCl) to the matrix helps suppress ionization of the analyte by providing excess electrons, stabilizing neutral atoms. This method minimizes spectral interferences, improving sensitivity and precision.