MIP (Membrane Interface Probe)

Envirosoil has the necessary equipment to execute on-site MIP (Membrane Interface Probe) tests for the qualitative detection of volatile components, such as fuels (petrol, diesel) or degreasing agents (Per, Tri,...). These probes allow the number of drillings and monitoring wells to be reduced in the context of a soil survey and to place the monitoring wells at the correct depths. In other words, the avoidance of “incorrectly placed” monitoring wells, because the surface is incalculable in many places.

What is MIP?

MIP stands for Membrane Interface Probe. It is an in-situ measurement technique for the on-site detection of the presence of certain pollutants in the soil. The MIP technique consists of evaporating the pollutants from the soil and the groundwater through a probe with an opening at the bottom and a gas flow through the probe and heating around the opening in the probe, and transporting them with the gas flow to the surface for analysis on a number of specific detections.

We can do the following for you

  • Detect difficult detectable components with the FID, PID and DELCD detectors on a gas chromatograph
  • Identify fuel components (BTEX, mineral oil) and chlorinated compounds (degreasing products, such as PER, Tri and degradation products)
  • Localise and demarcate a contamination (in greater depths) vertically and horizontally
  • Assess the soil structure and the state of contamination quickly and in detail
  • Localise the cause of a contamination
  • Determine interesting sampling and monitoring locations
  • Execute an accurate risk assessment

In addition to conducting the aforementioned in situ measurement technique, Envirosoil can also conduct groundwater sampling at specific depths. We do this without installing permanent monitoring wells via a steel filter in a tube that is pressed into the soil down to the desired depth. The feeding tube is then pulled up from there, allowing the groundwater to penetrate into the filter and it can thus be sampled.

The results can be read in situ on the computer. (This is useful for adjusting the probes, if necessary). These results also simplify the (cost-efficient) dimensioning of further surveys, such as determining the depth of the drilling and monitoring wells; choosing the length of the filter; etc. The simultaneous determination of the conductivity allows for getting knowledgeable with regards to the nature of the soil and to better understand the diffusion mechanisms (amongst others, soil contamination).