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Membrane Interface Probe
Response to Low Concentrations
      of Trichloroethene

      Prepared by:   S2 C2 inc.
S2 C2 inc.
Introduction
• The following tests were completed using the
  Geoprobe® Systems Membrane Interface
  Probe (MIP...
S2 C2 inc.
MIP Configuration
• The following components were used to
  conduct this test:
  – MP6520 MIP Probe with new me...
S2 C2 inc.
MIP System Settings
• The MIP system was set as follows:
  – Heater set to 120°C
  – Pressure gauge: 20psi
  – ...
S2 C2 inc.
    2 inc.
S2 C2 inc.
    2 inc.
S2 C2 inc.
    2 inc.
S2 C2 inc.
Field Considerations
• These tests were conducted under ideal laboratory
  conditions
• In the field, the follo...
S2 C2 inc.
Field Considerations (con’t)
• Groundwater confirmation sampling
  – Following a MIP investigation, confirmatio...
S2 C2 inc.
Key Points
• These tests show that on the most sensitive
  setting, the XSD is capable of consistently
  detect...
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Mip Response To Low Concentrations Of Tce

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Mip Response To Low Concentrations Of Tce

  1. 1. Membrane Interface Probe Response to Low Concentrations of Trichloroethene Prepared by: S2 C2 inc.
  2. 2. S2 C2 inc. Introduction • The following tests were completed using the Geoprobe® Systems Membrane Interface Probe (MIP) • The purpose of these tests is to show the response of a halogen-specific detector (XSD) to low level concentrations (<1ppm) of trichloroethene (TCE)
  3. 3. S2 C2 inc. MIP Configuration • The following components were used to conduct this test: – MP6520 MIP Probe with new membrane – PEEK trunkline (Teflon to membrane, PEEK to GC) – FI6000 Field Instrument – MP6500 MIP Controller – Field laptop with DI Acquisition software – HP 5890 gas chromatograph – OI Analytical 5300 XSD
  4. 4. S2 C2 inc. MIP System Settings • The MIP system was set as follows: – Heater set to 120°C – Pressure gauge: 20psi – Flow Controller: 9.5psi – Flow to membrane: 42.3mL/min – Flow to GC: 41.2mL/min – Trip time: 30sec – XSD set to highest sensitivity
  5. 5. S2 C2 inc. 2 inc.
  6. 6. S2 C2 inc. 2 inc.
  7. 7. S2 C2 inc. 2 inc.
  8. 8. S2 C2 inc. Field Considerations • These tests were conducted under ideal laboratory conditions • In the field, the following will not be controlled: – Soil matrix properties • These tests were done in a pure water-solvent matrix • Different matrices may increase or decrease response – Chemical constituents present in the matrix • These tests used TCE only • The soil matrix may include breakdown products (cis-DCE, trans- DCE, vinyl chloride) that may respond differently – Chemical phase • These tests used only dissolved-phase TCE • Residual, free product, and vapor phase TCE will alter response
  9. 9. S2 C2 inc. Field Considerations (con’t) • Groundwater confirmation sampling – Following a MIP investigation, confirmation sampling is recommended – Because the XSD detects total halogenated volatiles, correlating a peak response to a concentration of a single compound is difficult – The MIP takes 20 readings in a foot compared to a groundwater sampler which will typically draw a sample from a 3ft interval (i.e., Geoprobe® SP16) • This will essentially ‘dilute’ a small interval that had a high XSD response • A conventional monitoring well with a typical 10ft screen will intensify this dilution effect
  10. 10. S2 C2 inc. Key Points • These tests show that on the most sensitive setting, the XSD is capable of consistently detecting as low as 50ppb of TCE in an ideal laboratory setting • Field conditions may alter detection limits • Correlating XSD response to actual concentrations in groundwater should be accomplished by collecting collaborative data sets.

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