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Temperature-Related Stability in Plasma Spectrometry Jerry Dulude, Ron Stux, and Vesna Dolic, Glass Expansion,

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Presentation on theme: "Temperature-Related Stability in Plasma Spectrometry Jerry Dulude, Ron Stux, and Vesna Dolic, Glass Expansion,"— Presentation transcript:

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

2 Glass Expansion www.geicp.com 1 Causes of Signal Drift in ICP-OES 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 ???????? Cause Solution

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

4 Glass Expansion www.geicp.com 1 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

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

6 Glass Expansion www.geicp.com 1 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

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

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

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

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

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

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

13 Glass Expansion www.geicp.com 1 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

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

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

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

17 Glass Expansion www.geicp.com 1 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

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

19 Glass Expansion www.geicp.com 1 Temperature vs. Intensity (Varian Vista MPX) 10% decrease from 20 to 40C or 0.5% per degree C 29% increase from 10 to 40C or 1% per degree C 1.8mm bore2.3mm bore

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

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

22 Glass Expansion www.geicp.com 1 Effect of Temperature on Intensity 20ul/min uptake rate 133% increase from 21 to 40C or 7% per degree C Avg. Intensity Estimated Transport Efficiency

23 Glass Expansion www.geicp.com 1 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

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

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