Atomic absorption spectroscopy. In this experiment, the characteristics of flame ASS instrumentation will be explored. Pb and Mg calibrate curve will be investigated.

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Atomic absorption spectroscopy

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Aim

In this experiment, the characteristics of flame ASS instrumentation will be explored. Pb and Mg calibrate curve will be investigated. Different condition will be used, such as different ion interference, different flame and background effects. All solution will be carried out in low concentration (ppm).

Theory

Atomic-absorption spectroscopy (AAS) is based on the absorption of light to measure the concentration of compound. The samples are usually liquids or solids, the analyte atoms or ions are vaporized in a flame or graphite furnace. The atoms absorb ultraviolet or visible light and make transitions to higher electronic energy levels. The analyte concentration is determined from the amount of absorption. The evaluation of ASS measurements is also similar to the UV-Vis spectrophotometry, because it is based on Beer's Law, which says that the absorption of light is directly proportional to the number of atoms absorbing it. The more concentrated the sample solution is, the higher absorbance is measured. [1]

All atoms have energy. Under normal conditions, atoms exist in their most stable states. So we cannot measure the energy state for an atom. we only can measure it when we