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Atomic Absorption and Emission

Atomic Absorption and Emission. Flame Tests. Picture from: http://aarcaro.wordpress.com/10th/mathenvirochem/flame-test-lab/. What causes the colour of the metal ions in the flame test?. Photon of light released when electron returns to lower energy level.

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Atomic Absorption and Emission

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  1. Atomic Absorption and Emission

  2. Flame Tests Picture from: http://aarcaro.wordpress.com/10th/mathenvirochem/flame-test-lab/ What causes the colour of the metal ions in the flame test?

  3. Photon of light released when electron returns to lower energy level Photon of light released when electron returns to lower energy level Electron is excited to higher energy level

  4. Limitations of Flame Test Not sensitive Qualitative only Can only be used for a small number of metal ions Contamination of salts will result in inaccurate analysis as the flame colour will alter There can be difficulty distinguishing the flame colour.

  5. Emission Spectrum of Hydrogen Animation of spectral lines for H Picture from: http://www.800mainstreet.com/spect/emission-flame-exp.html

  6. Balmer Series for Hydrogen Adapted from: http://www.avogadro.co.uk/light/bohr/spectra.htm Ground state Excite Balmer Series

  7. Atomic Absorption Spectroscopy (AAS) http://www.youtube.com/watch?v=HBegTB_WDxQ http://www.youtube.com/watch?v=WkcioQGfAgU&feature=player_embedded

  8. * * Photons of specific wavelenghts chopped into pulses Sample compound atomises Hollow Cathode Lamp * Hg Specific wavelengths are not absorbed if atom is not Hg – move to monochromator and detector Hg * Hg * Excited Hg atoms release photons (*) of specific wavelengths when electrons return to ground state Hg atoms absorb specific wavelengths of light – causes electrons to excite – light not transmitted to monochromator or detector Y X Hg Hg Z Sample injected More detailed animations http://www.umd.umich.edu/casl/natsci/slc/slconline/ADVAA/AdvAA.swf http://www.shsu.edu/~chm_tgc/sounds/sound.html - flash video with sound

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