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Temperature-Related Stability in Plasma Spectrometry

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  1. Temperature-Related Stability in Plasma Spectrometry Jerry Dulude, Ron Stux, and Vesna Dolic, Glass Expansion, jdulude@geicp.com

  2. Optical drift RF instability Sample related baseline shift Matrix variations Drift in sample intro temperature Profiling & thermostat Feedback loop Background correction Internal std. or matrix matching ???????? Causes of Signal Drift in ICP-OES Cause Solution Glass Expansion www.geicp.com 1

  3. IsoMist™ Programmable Temperature Spray Chamber (PTSC) Glass Expansion www.geicp.com 1

  4. IsoMist Characteristics • Programmable from -10 to 60C in 1 degree increments • Maintains temperature to within 0.1 degree • Built-in Peltier device • No external plumbing • Temperature measured near the chamber surface Glass Expansion www.geicp.com 1

  5. IsoMist on Optima 2100DV Glass Expansion www.geicp.com 1

  6. PE 2100DV Standard Parameters • Power: 1450 watts • Coolant gas: 15LPM • Aux. gas: 0.2LPM • Quartz injector, 1.8mm bore • Neb. Gas: 0.7LPM • SeaSpray concentric glass nebulizer (1ml/min) • IsoMist Programmable Temperature spray chamber with Twister Baffled Cyclonic Glass Expansion www.geicp.com 1

  7. Intensity vs. Temperature-PE 2100DV(1ml/min uptake) Glass Expansion www.geicp.com 1

  8. AVG INTENSITY Temperature Plots on PE 2100DV 31% increase from 10 to 25C or 2% per degree C 31% increase from 25 to 35C or 3% per degree C Glass Expansion www.geicp.com 1

  9. Transport Efficiency AVG INTENSITY Temperature Plots on PE 2100DV Glass Expansion www.geicp.com 1

  10. Transport Efficiency AVG INTENSITY Temperature Plots on PE 2100DV Avg. suppression of all lines Interference std: 1000ppm Na + K, 500ppm Ca Glass Expansion www.geicp.com 1

  11. Transport Efficiency AVG INTENSITY Temperature Plots on PE 2100DV Avg. suppression of all lines Avg. suppression of ion lines Interference std: 1000ppm Na + K, 500ppm Ca Glass Expansion www.geicp.com 1

  12. IsoMist on the Varian Vista MPX Glass Expansion www.geicp.com 1

  13. Varian Vista MPX Standard Parameters • Power: 1300 watts • Coolant gas: 15LPM • Aux. gas: 1.5LPM • Quartz injector, 2.3mm bore • Neb. Gas: 0.8LPM • SeaSpray concentric glass nebulizer (0.4ml/min) • IsoMist Programmable Temperature spray chamber with Twister Baffled Cyclonic Glass Expansion www.geicp.com 1

  14. Effect of Spray Chamber Temperature on Intensity (Varian Vista MPX) Glass Expansion www.geicp.com 1

  15. Effect of Temperature on IntensityVarian Vista MPX 10% increase from 20 to 25C or 2%/degree C Glass Expansion www.geicp.com 1

  16. Effect of Spray Chamber Temperature Varian Vista MPX Transport Efficiency Avg. Intensity Glass Expansion www.geicp.com 1

  17. Varian Vista MPX Parameters • Power: 1300 watts • Coolant gas: 15LPM • Aux. gas: 1.5LPM • Quartz injector, 1.8mm bore • Neb. Gas: 0.8LPM • SeaSpray concentric glass nebulizer (0.4ml/min) • IsoMist Programmable Temperature spray chamber with Twister Baffled Cyclonic Glass Expansion www.geicp.com 1

  18. Temperature vs. Intensity (Varian Vista MPX- 1.8mm bore) Glass Expansion www.geicp.com 1

  19. Temperature vs. Intensity (Varian Vista MPX) 1.8mm bore 2.3mm bore 10% decrease from 20 to 40C or 0.5% per degree C 29% increase from 10 to 40C or 1% per degree C Glass Expansion www.geicp.com 1

  20. Low Sample Uptake Applications • Biological applications • Intracellular fluids • Neonatal samples • Forensic applications • Speciation (HPLC-ICP-MS) • Radioactive wastes reduction • Low DL’s desirable Glass Expansion www.geicp.com 1

  21. Effect of Temperature on Normalized Intensity (20 uL/min uptake rate) PE Optima 2100DV Glass Expansion www.geicp.com 1

  22. Effect of Temperature on Intensity20ul/min uptake rate Avg. Intensity Estimated Transport Efficiency 133% increase from 21 to 40C or 7% per degree C Glass Expansion www.geicp.com 1

  23. Spray Chamber Temperature Impact • High impact with respect to intensity • Interdependent with other plasma parameters • Provides another dimension for optimization • Must remain constant during the experiment Glass Expansion www.geicp.com 1

  24. Constant temperature benefits(1ml/min sample uptake) • Higher accuracy • Higher productivity • Greater reproducibility • Better experiments Glass Expansion www.geicp.com 1