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ATOMIC SPECTROMETRY Flames Electrothermal Atomizers Plasmas

ATOMIC SPECTROMETRY Flames Electrothermal Atomizers Plasmas. X = laser plasmas stellar interior. Na. Mg +. Na Spectrum. Combustion zones in the common Bunsen Burner. Combustion zones in a pre-mixed, elongated, laminar flame. Temperature profiles for a natural gas-air flame.

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ATOMIC SPECTROMETRY Flames Electrothermal Atomizers Plasmas

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  1. ATOMIC SPECTROMETRY • Flames • Electrothermal Atomizers • Plasmas

  2. X = laser plasmas stellar interior

  3. Na Mg+

  4. Na Spectrum

  5. Combustion zones in the common Bunsen Burner

  6. Combustion zones in a pre-mixed, elongated, laminar flame

  7. Temperature profiles for a natural gas-air flame.

  8. Air-Acetylene Flame Fuel-air ratios

  9. How do we introduce liquid samples into the flame? Direct Insertion… Total Consumption Burner

  10. Total Consumption Burner

  11. VERY NOISY!! Total Consumption Burner

  12. Plan B: Use a nebulizer

  13. Concentric nebulizer Crossed-flow nebulizer

  14. Ball-type Babington nebulizer for viscous samples V-Groove Babington nebulizer

  15. Pre-mixed flame system with concentric nebulizer and spray chamber

  16. Perkin-Elmer Burner System

  17. Burner Head Design (Looking down from above) Emission/Fluorescence Absorption

  18. Fraction of analyte present as neutral free gaseous atom in the flame

  19. Background Emission from Flames Oxygen - Hydrogen Oxygen - Acetylene Nitrous oxide - Acetylene

  20. Flame Absorption Profiles vary by element

  21. Signals also vary with sample flow rate

  22. Block Diagram of a Flame Emission Spectrometer

  23. Schematic Diagram of a single-beam atomic absorption spectrometer

  24. The monochromator in an atomic absorption experiment simply isolates the appropriate spectral line from all of the lines emitted by the light source

  25. Atomic Absorption Spectrometers

  26. Continuum Source Background Correction

  27. Continuum Source Background Correction

  28. Representative Flame Detection Limits (ng/mL)

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