Which method among the listed calcium measurement approaches uses atomic absorption spectroscopy?

Which method among the listed calcium measurement approaches uses atomic absorption spectroscopy?

• A. AAS
• B. ISE
• C. Dye binding
• D. Precipitation/Redox techniques

Answer: (A)

Atomic absorption spectroscopy identifies calcium by measuring how many free calcium atoms absorb light at a calcium-specific wavelength when the sample is atomized. In this technique, the sample is turned into atoms in a flame or graphite furnace, and light from a calcium-specific source is shone through them. The amount of light absorbed at the characteristic calcium wavelength (about 422.7 nm) is directly related to the calcium concentration. This approach is highly selective for calcium and quite sensitive, making it ideal when precise or trace-level measurement is needed. Other listed methods rely on different principles: ion-selective electrodes gauge calcium activity in solution via electrical potential, dye-binding methods use a color change from a calcium-dye complex, and precipitation or redox methods depend on chemical reactions to infer calcium. Hence, the method that uses atomic absorption spectroscopy is the one that quantifies calcium by absorbing light with calcium atoms.

Atomic absorption spectroscopy identifies calcium by measuring how many free calcium atoms absorb light at a calcium-specific wavelength when the sample is atomized. In this technique, the sample is turned into atoms in a flame or graphite furnace, and light from a calcium-specific source is shone through them. The amount of light absorbed at the characteristic calcium wavelength (about 422.7 nm) is directly related to the calcium concentration. This approach is highly selective for calcium and quite sensitive, making it ideal when precise or trace-level measurement is needed. Other listed methods rely on different principles: ion-selective electrodes gauge calcium activity in solution via electrical potential, dye-binding methods use a color change from a calcium-dye complex, and precipitation or redox methods depend on chemical reactions to infer calcium. Hence, the method that uses atomic absorption spectroscopy is the one that quantifies calcium by absorbing light with calcium atoms.