Which is the meaning of the acronym AAS in the context of lead analysis?

• A. American Association for Laboratory Accreditation
• B. Advanced Analytical Science
• C. Atomic Absorption Spectrometry
• D. Association for Analytical Standards

Answer: (C)

Atomic Absorption Spectrometry is the method used to quantify lead by measuring how much light is absorbed by lead atoms in the vapor phase. In AAS, the sample is atomized in a flame or graphite furnace, and light at a wavelength specific to lead passes through the atomized sample. The amount of light absorbed at that lead-specific wavelength is proportional to the concentration of lead in the sample (according to Beer-Lambert behavior). This technique is well-suited for trace metal analysis because it offers good sensitivity, relatively simple sample prep, and reliable calibration with standards.

The other options refer to organizations or general terms rather than the analytical technique used for measuring lead, so they don’t describe the method involved in lead analysis.