Diffusion is a physical process according to which, molecules migrates from high to low concentration area. In this way, a mass transfer process is ensured. According to this principle, ENVINT developed a series of passive samplers for the sampling of atmospheric pollutants. They contain a reactive layer which irreversibly adsorbs the molecules of interest. After sampling, the layer is removed and analysed.
ENVINT srl developed a series of diffusion devices, including that based on the “Built in chemistry” which contains a reactive surface (for instance, an oxydiser) which is able to convert one species into another one more suitable for sampling. This is the case of conversion of Nitrogen Oxide into Nitrogen Dioxide.
According to this scheme, ENVINT will adapt the diffusion devices as sensors for atmospheric pollutants, starting with Nitrogen Dioxide.