On-site soil VOCs monitoring by Membrane Inlet Probe plus MS200 TOF MS ( work by Green River)
Geoprobe soil sampling on-site
The Geoprobe MIP system is a modern technique for soil VOCs sampling and monitoring. The system combines a Membrane Inlet Probe (MIP) and a GC-ECD/FID. The Geoprobe MIP is a driller equipped with a heated membrane inlet. When the probe is pushed underground, VOCs in the soil permeate through the membrane, leaving the water behind. A Nitrogen stream is delivered to the probe to bring the VOCs back to the GC-ECD/FID. In conventional operation, when the GC-ECD/FID signal rises, the nitrogen carrier gas is collected in a tedlar bag and sent to a GCMS laboratory for analysis of hazardous compounds.
When Geoprobe MIP is connected to an MS200, it becomes an on-site soil contaminant sampling and analysis system. MS200 is a high performance TOF mass spectrometer; it can do the qualification and quantification of VOCs in seconds. When the driller is pushing down, we can easily obtain the compound and concentration information as a function of the soil depth.
Use the MIP+MS200 TOF MASS to monitor the following chlorinated compounds in underground soil:
- Sampling time:
- Mass Range:
Sample preparation for calibration
Prepare 4 different concentrations of chlorinated compounds in 50L water tank. Immerse the MIP into the water tank then obtain the calibration curve of each compound.
We find that there is roughly a ratio of 1000 between the concentration in water (ppm) and the vapour concentration measured by the MS200 (ppb).
|Component name||Coefficient ( counts)||Calibrated concentration (ppm)|
The MIP + MS200 TOF-MS system provides a fast and accurate on-site soil VOCs detection solution. You don't need to collect lots of sample and don't need to wait a long time to get the result. When use this system in soil remediation, it reduces the time to find the contaminated area significantly.
Last updated: 10:52 24/06/2016
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