Filter and equipment

Key properties of a REST filter are the ability to trap highest possible concentrations of TNT molecules during sampling and to desorb (release) a high percentage of the same molecules during analysis. The current filter cartridges (used by Mechem, NPA and NOKSH) may not possess these properties or there could be room for improvement. Another aspect is the ability to absorb particles during sampling. Particles contain much higher concentrations of TNT molecules than air at ground level. Filters capable of trapping more dust without clogging will therefore increase the overall mass of TNT in the filter.

FOI in Sweden has been asked to investigate the positive and negative properties of the currently used filter cartridges and to develop improved filters and sampling equipment.