C30J_2010_lecture_4 - C30J Chemical Analysis II Analytical...

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Unformatted text preview: C30J Chemical Analysis II Analytical Atomic Spectrometry Lecture 4 March 19, 2010 Atomic Absorption Spectrometry (continued) History of Atomic Absorption 19 Century: G. Kirchhoff and R. Bunsen explained phenomenon "Matter absorbs light at the same wavelength at which it emits light". 1955: Walsh (Australia), Alkemade and Milatz (Holland) demonstrated Flame AA Alan Walsh and the First AAS Instrument (circa 1959) Practical AAS: Instrumental Components External Radiation Source Atomizer Wavelength Selector Detector / Readout Sample Introduction System 1 2 3 4 5 Overall Flame AA Schematic Atomizers in AAS Combustion flame (FAAS) Heat of combustion of fuel and oxidant provides energy for atomization Slotted burner provides long path length for sensitivity (Absorbance also proportional to l) Flame Temperatures Disadvantages of flame atomization for AAS inefficient sample introduction low temperature reactive environment short residence time large sample consumption rate . Atomizers in AAS Electrothermal Atomizer (ETAAS), proposed in 1961 by Boris Lvov Electrically powered device, energy provided by ohmic heating Most common is a graphite tube then called Graphite Furnace AAS Graphite Furnace Atomization...
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C30J_2010_lecture_4 - C30J Chemical Analysis II Analytical...

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