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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Atomic absorption spectroscopy | 5/5 | https://en.wikipedia.org/wiki/Atomic_absorption_spectroscopy | reference | science, encyclopedia | 2026-05-05T10:03:45.133964+00:00 | kb-cron |
==== Background correction using a least-squares algorithm ==== The above technique can obviously not correct for a background with fine structure, as in this case the absorbance will be different at each of the correction pixels. In this case, HR-CS AAS is offering the possibility to measure correction spectra of the molecule(s) that is (are) responsible for the background and store them in the computer. These spectra are then multiplied with a factor to match the intensity of the sample spectrum and subtracted pixel by pixel and spectrum by spectrum from the sample spectrum using a least-squares algorithm. This might sound complex, but first of all the number of di-atomic molecules that can exist at the temperatures of the atomizers used in AAS is relatively small, and second, the correction is performed by the computer within a few seconds. The same algorithm can actually also be used to correct for direct line overlap of two atomic absorption lines, making HR-CS AAS the only AAS technique that can correct for this kind of spectral interference.
== Applications == AAS is typically used to measure the concentration of metals in a wide variety of substances. For example, AAS has been used to measure the concentration of Zinc in hair and plants, Magnesium in blood serum, Lead in gasoline, and heavy metals in fruits. This variety of applications results in AAS being used in fields from agriculture to medicine.
== See also == Absorption spectroscopy Beer–Lambert law Inductively coupled plasma mass spectrometry Laser absorption spectrometry
== References ==
== Further reading == B. Welz, M. Sperling (1999), Atomic Absorption Spectrometry, Wiley-VCH, Weinheim, Germany, ISBN 3-527-28571-7. A. Walsh (1955), The application of atomic absorption spectra to chemical analysis, Spectrochim. Acta 7: 108–117. J.A.C. Broekaert (1998), Analytical Atomic Spectrometry with Flames and Plasmas, 3rd Edition, Wiley-VCH, Weinheim, Germany. B.V. L'vov (1984), Twenty-five years of furnace atomic absorption spectroscopy, Spectrochim. Acta Part B, 39: 149–157. B.V. L'vov (2005), Fifty years of atomic absorption spectrometry; J. Anal. Chem., 60: 382–392. H. Massmann (1968), Vergleich von Atomabsorption und Atomfluoreszenz in der Graphitküvette, Spectrochim. Acta Part B, 23: 215–226. W. Slavin, D.C. Manning, G.R. Carnrick (1981), The stabilized temperature platform furnace, At. Spectrosc. 2: 137–145. B. Welz, H. Becker-Ross, S. Florek, U. Heitmann (2005), High-resolution Continuum Source AAS, Wiley-VCH, Weinheim, Germany, ISBN 3-527-30736-2. H. Becker-Ross, S. Florek, U. Heitmann, R. Weisse (1996), Influence of the spectral bandwidth of the spectrometer on the sensitivity using continuum source AAS, Fresenius J. Anal. Chem. 355: 300–303. J.M. Harnly (1986), Multi element atomic absorption with a continuum source, Anal. Chem. 58: 933A-943A. Skoog, Douglas (2007). Principles of Instrumental Analysis (6th ed.). Canada: Thomson Brooks/Cole. ISBN 0-495-01201-7.
== External links == Media related to Atomic absorption spectroscopy at Wikimedia Commons