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C30J_2010_lecture_3 - CHEM3001(C30J Chemical Analysis II...

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CHEM3001 (C30J) Chemical Analysis II Analytical Atomic Spectrometry Lecture 3 March 12, 2010
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Office Hours (D26) Wednesday, Thursday, Friday 10am – 11am Other times by appointment: [email protected]
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Atomic Absorption Spectrometry
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History of Atomic Absorption 19 Century: Kirchhoff and Bunsen explained phenomenon Up to 1950’s : Only astrophysics applications 1955: Walsh (Australia), Alkemade and Milatz (Holland) demonstrated Flame AAS 1959: First Commercial Flame AA 1960’s: Technique accepted
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Basic Principles E = h ν = hc / λ
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I o I I o > I Incident Intensity Transmitted Intensity
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Beer’s Law A = log 10 ( I 0 / I ) = l c A = Absorbance = absorption coefficient l = path length c = concentration
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Concentration A 0, 0 Slope = l Ideally...
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Essential Instrumental Components for Atomic Absorption 1. Sample Introduction System 2. External source of light energy 3. Atomizer 4. Wavelength selector 5. Detector to measure Intensity to calculate Absorbance
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Practical AAS: Instrumental Components External Radiation Source Atomizer Wavelength Selector Detector / Readout Sample Introduction System 1 2 3 4 5
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1. Sample Introduction System Flame AAS
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2. External Radiation Source
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