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Noxious Gases Ref Peaks: An Alternative to Dual Inlet Bellows

Noxious Gases Ref Peaks: An Alternative to Dual Inlet Bellows. Paul Eby. Normal Conflo Ref Gas. Ref Gas. He. GC / EA. - Ref Gas is always flowing (0.2mL/min). - Not okay for noxious gases. - CO, CH 3 Cl, SO 2. IRMS. - Small quantities / expensive gases. REF. SAMPLE. IRMS.

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Noxious Gases Ref Peaks: An Alternative to Dual Inlet Bellows

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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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