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Atomic absorption spectroscopy (AAS) is an analytical method based on the absorption of light at specific wavelengths by gaseous atoms. Atoms absorb energy when transitioning from lower energy (ground) states to higher (excited) energy states. The amount of absorption measured during this transition is proportional to the number of atoms in the ground state, allowing the concentration of the element in the sample to be determined. AAS offers exceptional sensitivity, particularly for the determin