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Passive diffusive sampling relies on the diffusion of analytes through a diffusive surface onto an adsorbent (Figure 1). After sampling, the analytes are chemically desorbed by solvent extraction or thermally desorbed and analysed. Passive sampling does not involve the use of heavy and encumbering pumping systems, is not impacted by power disruptions, does not require extensive supervision, is quiet, non-flammable and does not represent an explosion hazard. It can be performed by anyone, anywhere and at a very low cost. Moreover, it is not susceptible to sample breakthrough, a common problem associated with active sampling performed with an air pump.
For more details on diffusive sampling please refer to the
radiello Manual.
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 Figure 1: Diffusion Process |
Why has diffusive sampling not been extensively adopted until now?
Because of the limits set by its geometry, the axial symmetry of traditional passive samplers results in poor sensitivity and reproducibility. Uptake rate values are low and often highly variable depending on environmental conditions. The radiello sampler has overcome this limitations.
What is radiello?
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