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Alternative Method for Noxious Gas Peaks: Thermo Conflo IV Solution

Explore Thermo Conflo IV as an alternative to bellows for noxious gases like CO, CH3Cl, SO2 in IRMS analyses, with low gas consumption and continuous flow. ConFlo IV allows testing of peak steadiness and extra columns can be added through Configurator for CH3Cl measurements.

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Alternative Method for Noxious Gas Peaks: Thermo Conflo IV Solution

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  1. Noxious Gases Ref Peaks:An Alternative to Dual Inlet Bellows Paul Eby

  2. Normal Conflo Ref Gas Ref Gas He GC / EA - Ref Gas is always flowing (0.2mL/min) - Not okay for noxious gases - CO, CH3Cl, SO2 IRMS - Small quantities / expensive gases

  3. REF SAMPLE IRMS Using the Bellows GC / EA - Consumption is very low (0.02 to 0.002mL/min) - Continuously flows - Noxious gas exits with the pump exhaust - Requires dual inlet

  4. 37Cl Measurements • Precipitate chloride out as AgCl by adding AgNO3 • Convert AgCl to CH3Cl gas by reacting with CH3I • Run by GC-IRMS • Measured as CH3Cl Problems Requires an extra cup to measure masses 50 and 52 Bellows needed for toxic CH3Cl (also expensive) $ $ $ $

  5. Thermo Conflo IV Allows for 5 different reference gases, 2 at a time

  6. Thermo Conflo IV Ref A Ref B Can we leave the ref gas off until a peak is needed? Does the gas need to reach a steady state by constantly flowing? How long does it take to reach a steady state? Can I test this before upgrading the IRMS? Ref C IRMS

  7. Thermo Conflo IV in Isodat Extra columns added to the method using Configurator

  8. Carbon Dioxide On/Off Test ave = -0.01 stdev = 0.04 ave = -0.03 stdev = 0.02

  9. Carbon Dioxide On/Off Test

  10. Methyl Chloride Trials • Upgrade the detectors • Add ventilation to the Conflo IV • Pump exhaust vented • Small bomb of CH3Cl

  11. Methyl Chloride On/Off Test ave = -0.02 stdev = 0.02 ave = 0.01 stdev = 0.01

  12. Methyl Chloride On/Off Test

  13. Methyl Chloride On/Off Test

  14. Conclusions • ConFlo IV can be used to limit consumption of ref gas • Comparing to Bellows: • Flow rate in Conflo IV 0.2mL/min • Flow rate in bellows 0.02 - 0.002mL/min?

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