radiello® Diffusive Sampling

Radiello™ Cartridge Adsorbents for sampling HF, NO2, and SO2, matrix microporous PE impregnated with wet TEA.

Passive or diffusive sampling relies on the diffusion of analytes through a diffusive surface onto an adsorbent. After sampling, the analytes are chemically desorbed by solvent extraction or thermally desorbed and analyzed. Passive sampling 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 using an air pump.

Most commercially available passive/diffusive samplers are planar or axial in shape and offer lower sampling rates and limited sampling capacity. As a result, sensitivity can suffer during short-term analysis (due to low sampling rates), or during long-term sampling (analyte back-diffusion due to low capacity). The improved geometry of a radial coaxial design circumvents these issues. The essential parts of a radiello diffusive sampler are the adsorbing cartridge, the diffusive body, the supporting plate and the label with bar code indication. Note: To conduct air sampling using the Radiello system, Radiello diffusive bodies and triangular support plates must be ordered (separately) in addition to cartridge adsorbents. Radiello Starter Kits (RADxxxS) include all the necessary parts to complete a sampling.