On-site soil VOC monitoring.

Applications: On-site VOC monitoring

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.


The following work was carried out by our distributor in Taiwan, Green River Technology.


The aim was to use the Geoprobe MIP system in conjunction with the Kore MS-200 in order to monitor the following chlorinated compounds in underground soil:

  • Chloroform
  • Chlorobenzene
  • Trichloroethylene
  • Tetrachloroethene
  • Dichloromethane
  • 1.2-chloroethane
  • 1.1.2-trichloroethane


MS200 configuration

Sampling time:


Mass Range:



Sample preparation for calibration

They prepared 4 different concentrations of chlorinated compounds in a 50L water tank. They then immersed the MIP into the water tank, allowing them to then obtain the calibration curve of each compound.



We found that there is roughly a ratio of 1000 between the concentration in water (ppm) and the vapour concentration measured by the MS-200 (ppb).



Kore Technology is a centre of excellence in time-of-flight mass spectrometer technology and has a very strong R&D capability in terms of its personnel, all of whom have been heavily involved in a variety of analytical instrumentation development programmes.


If you have any questions please feel free to contact us via our online form or telephone us for more information, we offer a wide range of products and services to suit your requirements.


If you wish to purchase our products, please contact Kore sales at sales@kore.co.uk, or call +44 (0)1353 653030.

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