In this context, which arrangement does atomic absorption spectrometry rely on for quantitative analysis of elements?

In this context, which arrangement does atomic absorption spectrometry rely on for quantitative analysis of elements?

• A. Flame and graphite furnace
• B. Mass spectrometry
• C. UV-Vis spectroscopy
• D. Chromatography

Answer: (A)

Atomic absorption spectrometry quantifies elements by measuring how strongly free atoms in the sample absorb light at a wavelength specific to the element. The crucial step is atomization: the sample is converted into a cloud of ground-state atoms in a flame or in a graphite furnace. A light source emits radiation at the element’s characteristic wavelength, and this light passes through the atomized sample. The atoms absorb part of the light, and the detector records how much light is transmitted; less transmitted light means more absorption, which is proportional to the element’s concentration. The flame and graphite furnace are the atomizing arrangements that enable this measurement. A flame provides continuous atomization and is suitable for many elements, while a graphite furnace offers higher sensitivity because the sample is heated more intensely and resides longer in the hot zone, increasing absorption signals. Other techniques don’t fit this setup: mass spectrometry analyzes ions by mass-to-charge ratio, UV-Vis spectroscopy measures absorption by molecular species rather than atomic absorption, and chromatography separates components rather than measuring absorption by free atoms.

Atomic absorption spectrometry quantifies elements by measuring how strongly free atoms in the sample absorb light at a wavelength specific to the element. The crucial step is atomization: the sample is converted into a cloud of ground-state atoms in a flame or in a graphite furnace. A light source emits radiation at the element’s characteristic wavelength, and this light passes through the atomized sample. The atoms absorb part of the light, and the detector records how much light is transmitted; less transmitted light means more absorption, which is proportional to the element’s concentration.

The flame and graphite furnace are the atomizing arrangements that enable this measurement. A flame provides continuous atomization and is suitable for many elements, while a graphite furnace offers higher sensitivity because the sample is heated more intensely and resides longer in the hot zone, increasing absorption signals.

Other techniques don’t fit this setup: mass spectrometry analyzes ions by mass-to-charge ratio, UV-Vis spectroscopy measures absorption by molecular species rather than atomic absorption, and chromatography separates components rather than measuring absorption by free atoms.