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C30J_2010_lecture_2 - CHEM 3001(C30J Chemical Analysis II...

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CHEM 3001(C30J) Chemical Analysis II Analytical Atomic Spectrometry Lecture 2 March 5, 2010
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Types of Thermal Atomization sources used in AES Combustion flame Electric arc / spark Plasma
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Flame Atomic Emission Spectrometry aka Flame Photometry Usually used for easily excited elements e.g Group IA and IIA metals Na, K, Li, Cs Fast Inexpensive Good detection limits Few interferences
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Main Components of a system for AES Sample Introduction System 1 Atom Cell / Atomizer 2 Wavelength Selector 3 Detector / Readout 4
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Sample Introduction System Nebulizer Spray Chamber Nebulizer : Function is to convert the sample solution into a wet aerosol (droplets of liquid suspended in a gas) Several different types and designs Most common are pneumatic nebulizers , that work with a supply of pressurized gas
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(a) Concentric Nebulizer (Meinhard) - two concentric tubes; gas flows in outer tube and sample solution in the inner tube - Region of low pressure created at tip of capillary by the Bernoulli Effect - Sample solution aspirated - Column of liquid shattered into droplets of various diameters (primary aerosol)
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Pneumatic nebulizers (contd.)
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