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Hydride Generation Techniques

Hydride Generation Techniques. Hydride Generation Technique. Reduction Reaction : transform the Analyte in sample to Metal Hydride Metal Hydrides is easy to Evaporation Metal Hydrides is easy to Atomization Analysis with Flame AAS

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Hydride Generation Techniques

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  1. Hydride Generation Techniques

  2. Hydride Generation Technique • Reduction Reaction : transform the Analyte in • sample to Metal Hydride • Metal Hydrides is easy to Evaporation • Metal Hydrides is easy to Atomization • Analysis with Flame AAS • Suitable for Analyst some element that can be aMetal Hydrides : As Bi Se Sb Sn Te

  3. Reduction Reaction • The element was reduce by NaBH4 • The reaction occur in Acid condition • Generate the Metal Hydride gas • Metal Hydride gas pass to Flame AAS

  4. Boiling point of Metal Hydride

  5. Reduction Reaction NaBH4 Na+ + BH-4 2BH-4 B2H6 + H2 + 2e- As3+ + 3H+ + 6e- AsH3 6BH-4 As3+ 3H+ 3B2H6 + 3H2 + AsH3 + + B2H6 + 6H2O 2H3BO3 + 6H2

  6. Hydride Generator System Mixing Block Peristaltic pump To AAS NaBH4 Gas-Liquid Separator Acid Sample Mixing coil

  7. Hydride Generator System Absorption Cell Air/Acetylene Burner

  8. Hydride Generator System Absorption Light Source From Gas-Liquid Separator

  9. Calibration Graph Sample Absorbance X Sample Contentration X

  10. Working ranges & Sensitivities-Vapor Generation

  11. Metrix Interferences • Effect to Loss of analyte signal • The %Loss of analyte signal due element Interferences

  12. Metrix Interferences %Loss of Analyte signal due to element Interferences

  13. Metrix Interferences %Loss of Analyte signal due to element Interferences

  14. Cold Vapor Technique • For Analyst only Mercury (Hg) • Use NaBH4/SnCl2 to reduce Hg2+ to Hg0 • in acid condition • Hg0 absorb the light from light source@253.6 nm • No need to ignite flame

  15. Cold Vapor System Mixing Block Peristaltic pump To AAS NaBH4 /SnCl2 Gas-Liquid Separator Acid Sample Mixing coil

  16. Hydride Generator System Absorption Cell : Close Air/Acetylene Burner

  17. Hydride Generator System Absorption Light Source Hg0 From Gas-Liquid Separator

  18. Calibration Graph Sample Absorbance X Sample Contentration X

  19. Cold Vapor Technique : Advantage • High sensitivity • Analyte Hg in ppb range • Low interferences • Flameless Technique

  20. End

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