05a. Passive sampling using POM

Passive sampling using a semi-perminent Polyoxymethylene (POM) membrane device.

Inside the membrane is a high molecular weight cynthetic lipid molecule, which means that the contaminants diffuse through the transient cavity to become sorbed by the membrane.

Different thicknesses of 17µm, 40µm and 60µm are used for different purposes.

The Norwegien Geotechnical Institute use it especially to investigate the sorbtion and soil remediation potential of various biochars.

But they have the potential to discover:
– if any contaminant from the addition of biochar can be detected in the soil
– if any native contaminants from the soil can be absorbed by the biochar
(this is essentially if the biochar is a source or sink of contaminants i.e. PAHs).

Advantages: it is easy to deploy, has low detection limits and can detect a mixture of PAHs, PCBs and Dioxins among other things – which are all produced as a result of the burning process.

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