AAS – Atomic Absorption Spectroscopy/FES – Flame Emission Spectroscopy
The AAS/FES is an analytical method for the qualitative and quantitative detection of metals. The method is based on the weakening of a radiation through interaction with free atoms. After converting the sample into an analyzable solution, it is nebulized and transported into an atomizer (e.g. an acetylene/air flame). For the atomic excitation and as reference light source an element-specific hollow-cathode lamp is used. Due to absorption, the radiation intensity is reduced and measured after decomposition in a monochromator on the element-specific absorption line. The concentration of the respective element is quantified by comparing the radiation intensity between sample and reference measurement.
With a portfolio of approx. 50 hollow-cathode lamps, we can detect many metals by AAS/FES. However, ICP-AES and ICP-MS are primarily used for quantitative metal analyses, due to their high level of performance. In addition to the quantification of some elements, we also use atomic absorption spectroscopic measurements for plausibility or control analyses.