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ATOMIC SPECTROMETRY Flames Electrothermal Atomizers Plasmas

ATOMIC SPECTROMETRY Flames Electrothermal Atomizers Plasmas. The graphite furnace: a resistively heated carbon tube. Sample Introduction. L’vov Platform: Maintains even temperature across sample area. Graphite Cup Atomizer. Graphite Furnace Mount. Graphite Furnace Gas Flow.

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ATOMIC SPECTROMETRY Flames Electrothermal Atomizers Plasmas

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  1. ATOMIC SPECTROMETRY • Flames • Electrothermal Atomizers • Plasmas

  2. The graphite furnace: a resistively heated carbon tube

  3. Sample Introduction

  4. L’vov Platform: Maintains even temperature across sample area

  5. Graphite Cup Atomizer

  6. Graphite Furnace Mount

  7. Graphite Furnace Gas Flow

  8. Atomization Cycle: Programmed Temperatures

  9. Standard and Sample Signals

  10. Background Correction in • Atomic Absorption Spectrometry • Double Beam Paths • Continuum Source • Zeeman Splitting • Nearby Wavelengths (Near-lines) • Source Broadening

  11. Dual Beam Paths (usually not feasible)

  12. Continuum Source Background Correction

  13. Continuum Source Background Correction (line source passes through furnace) Analyte Absorbance + Background Absorbance

  14. Continuum Source Background Correction (continuum source passes through furnace) Background Only

  15. Zeeman Background Correction

  16. Zeeman Background Correction Permanent Magnet on Atomizer Absorber Profile (always split) Source Profile (not split) Polarizer passes perpendicularly polarized light Polarizer passes parallel polarized light

  17. Zeeman Background Correction Permanent Magnet on Atomizer – Rotating Polarizer Absorber Profile (always split) Source Profile (not split) Polarizer passes perpendicularly polarized light Background Only Polarizer passes parallel polarized light Absorbance + Background

  18. Zeeman Background Correction Modulating Magnet on Atomizer – Fixed Polarizer Absorber Profile (magnet on-off) Source Profile (not split) Polarizer passes perpendicularly polarized light Background Only Polarizer passes perpendicularly polarized light Absorbance + Background

  19. Zeeman Background Correction Permanent Magnet on Source – Rotating Polarizer Absorber Profile (not split) Source Profile (always split) Polarizer passes perpendicularly polarized light Background Only Polarizer passes parallel polarized light Absorbance + Background

  20. Nearby Wavelength Correction

  21. Nearby Wavelength Correction

  22. Nearby Wavelength Correction Background + Analyte Background Only

  23. High Resolution Continuum Source Spectra

  24. High Resolution Continuum Source Spectra

  25. High Resolution Continuum Source Spectra

  26. High Resolution Continuum Source Spectra

  27. High Resolution Continuum Source Spectra

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