Performance of an Inert Self-aspirating Micro flow Nebulizer - PowerPoint PPT Presentation

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Performance of an Inert Self-aspirating Micro flow Nebulizer
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Performance of an Inert Self-aspirating Micro flow Nebulizer

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  1. Performance of an Inert Self-aspirating Micro flow Nebulizer Salar Samii, Jonathan A. Levine, Kaveh Kahen, and Akbar Montaser The George Washington University Department of Chemistry Washington, DC 20052 Jerry Dulude and Bobby Brezni Glass Expansion Melbourne, Australia

  2. Introduction In recent years, nebulizers used in inductively coupled plasma (ICP) spectrometry, particularly in ICPMS, operate at lower uptake rates to enhance the transport efficiency and to reduce oxide formation. In this study, a new PFA nebulizer (Glass Expansion) is examined, in terms of droplet size and velocity distributions, at a self-aspirating rate of 10 ml/min. The results are compared to data obtained for several concentric glass nebulizer.

  3. Sample Introduction Components Twister spray chamber With Helix nebulizer fitting Conikal AR30-1-FC2E MicroMist AR30-1-FM005E OpalMist AR30-1-PFA001

  4. Critical Dimensions Conikal Capillary i.d. Gas Annulus Area Gas Orifice i.d. 280 mm 320 mm 12 mm MicroMist Gas Annulus Area Capillary i.d. Gas Orifice i.d. 123 mm 240 mm 16 mm OpalMist Capillary i.d. Gas Orifice i.d. Gas Annulus Area 360 mm 60 mm 55 mm

  5. The Phase Doppler Particle Analyzer Transmitting probe Ar+ laser Fiberoptics light coupler Measurement volume Receiver optics Computer PMT detectors Measurement electronics

  6. Conikal 100 D32 = 17.2 60 20 Droplet Size Distribution (Primary Aerosol) Nebulizer Gas Flow Rate = 1.0 L/Min Solution Uptake Rate = Natural Aspiration MicroMist 100 D32 = 7.1 60 Normalized Count Normalized Volume 20 OpalMist 100 D32 = 12.8 60 20 10 0 10 20 30 40 50 60 0 20 30 40 50 60 Diameter (mm) Diameter (mm)

  7. Conikal 100 D32 = 19.2 60 20 Droplet Size Distribution (Primary Aerosol) Nebulizer Gas Flow Rate = 0.6 L/Min Solution Uptake Rate = 80 µL/Min MicroMist 100 D32 = 10.4 60 Normalized Count Normalized Volume 20 OpalMist 100 D32 = 14.2 60 20 10 10 0 20 30 40 50 60 0 20 30 40 50 60 Diameter (mm) Diameter (mm)

  8. Droplet Size Distribution (Primary Aerosol) Nebulizer Gas Flow Rate = 0.2 L/Min Solution Uptake Rate = 80 µL/Min Conikal 100 D32 = 27.0 60 20 MicroMist 100 D32 = 23.7 60 Normalized Count Normalized Volume 20 OpalMist 100 D32 = 24.5 60 20 0 0 20 40 60 80 20 40 60 80 Diameter (mm) Diameter (mm)

  9. Droplet Size Distribution (Primary Aerosol) Conikal MicroMist 100 Nebulizer Gas Flow Rate = 1.0 L/Min Uptake Rate = Natural Aspiration D32 = 17.2 1.0 L/Min Natural Aspiration 7.1 60 20 100 0.6 L/Min 80 µL/Min 19.2 0.6 L/Min 80 µL/Min 10.4 60 Normalized Count Normalized Count 20 100 0.2 L/Min 80 µL/Min 27.0 0.2 L/Min 80 µL/Min 23.7 60 20 0 20 40 60 80 0 20 40 60 80 Diameter (mm) Diameter (mm)

  10. Droplet Velocity Distribution (Primary Aerosol) Conikal MicroMist 300 Nebulizer Gas Flow Rate = 1.0 L/Min Uptake Rate = Natural Aspiration Vx = 40.8 m/s 1.0 L/Min Natural Aspiration 53.9 200 100 400 0.6 L/Min 80 µL/Min 29.7 0.6 L/Min 80 µL/Min 32.7 200 Counts 0 900 0.2 L/Min 80 µL/Min 10.1 0.2 L/Min 80 µL/Min 11.6 600 300 0 0 20 40 60 80 100 120 20 40 60 80 100 120 Axial Velocity (m/s) Axial Velocity (m/s)

  11. Droplet Velocity Distribution (Primary Aerosol) MicroMist 300 Nebulizer Gas Flow Rate = 1.0 L/Min Uptake Rate = Natural Aspiration Vx = 48.9 m/s 200 100 Counts 450 0.6 L/Min 80 µL/Min 29.5 300 150 0 20 40 60 80 100 120 Axial Velocity (m/s)

  12. Droplet Size Distribution (Tertiary Aerosol) Nebulizer Gas Flow Rate = 1.0 L/Min Solution Uptake Rate = Natural Aspiration Conikal 100 D32 = 4.9 60 20 MicroMist 100 D32 = 5.0 60 Normalized Count 20 OpalMist 100 D32 = 6.1 60 20 0 10 20 30 40 50 Diameter (mm)

  13. Conclusions • The size and velocity of the aerosol produced by three Glass Expansion nebulizers were examined. • The results showed that the MicroMist nebulizer produced the finest primary aerosol with the smallest D32 value obtained at a gas flow rate of 1.0 L/min. • The tertiary aerosol obtained at a gas flow rate of 1.0 L/min was generally fine for all three nebulizers with the Conikal nebulizer producing the smallest D32 values. • The results suggest that although the MicroMist nebulizer is probably the most suitable nebulizer (among the three) for direct injection nebulization in ICP, significant improvements in terms of aerosol size distribution must be made.