Dependence on sampling rates of Radiello® diffusion sampler for BTEX measurements with the concentration level and exposure time

To try to explain the variations of these sampling rates, the breakthrough volumes (VB) of BTEX on Carbograph 4 have been determined at different temperature and concentration conditions in order to evaluate the Langmuir parameters and their adsorption enthalpy (−ΔHads) using the Van't Hoff equation. With regard to these adsorption characteristics, the dependence of sampling rates with concentration level and exposure time were analysed and discussed.