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Atomic Absorption. Terry A. Ring Chemical Engineering University of Utah. E= -13.6 eV Z 2 /n 2. Photo absorption/emision. Atomic Absorption. Lamps are Special. Cathode with receptacle for material Vapor of Material to be analyzed Vapor Excited by plasma Light of particular wavelength.

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Atomic absorption l.jpg

Atomic Absorption

Terry A. Ring

Chemical Engineering

University of Utah





Lamps are special l.jpg
Lamps are Special

  • Cathode with receptacle for material

  • Vapor of Material to be analyzed

  • Vapor Excited by plasma

  • Light of particular wavelength


Aerosol flow l.jpg
Aerosol Flow

  • Burner Fuel (& oxidizer) mixed with aerosol of sample

  • Sample asperated into burner

  • Flame ionizes Sample


Intensity vs wavelength in aa l.jpg
Intensity vs Wavelength in AA

  • Light Source

  • Absorbance

  • Monochromatic

  • Detector


Analysis l.jpg
Analysis

  • Absorption of Light

  • Electrons are excited

  • Light Intensity on detector is less



Other aa s l.jpg
Other AA’s

  • Flame

  • Spark

  • Arc

  • Plasma

  • Laser

  • X-ray


Atomic emission spectroscopy l.jpg
Atomic Emission Spectroscopy

  • Flame is used to generated Atoms with excited electrons and ions

  • Light is filtered in spectrometer to give Intensity vs wavelength


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Spectrometer

  • Emitted Light

  • Broken into different color components

    • Prism

    • Grating


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X-ray Fluorescence

  • Two Steps

    • Absorption of X-ray

      • Elimination of electron for k or L shell

    • Collapse of M shell electron to fill hole

      • Light emission (x-ray)


Potential x ray emissions l.jpg
Potential X-ray Emissions

  • From K shell hole

    • K, K, K,

    • Zeeman Effect - 1, 2, 3

  • From L shell hole

    • L, L, L,


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Generation of X-rays

  • High Voltage Electrons

  • Electron Scattering

  • Electron Absorption

    • X-ray photo ionization


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XRF

  • Energy-dispersive XRF

  • Wavelength-dispersive XRF


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XRF Detectors

  • Energy-dispersive XRF

    • Semiconductor

  • Wavelength dispersive XRF

    • Scintilation Counter


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XRF Analysis

  • Samples can be in any form

    • Solid

    • Powder

    • Liquid


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