Community Research and Development Information Service - CORDIS


In general, temperature affects the diffusion sampling mechanism in different ways:
-By changing the diffusive coefficient.
-By modifying the adsorption capacity, which controls the gradient of diffusion.

In both cases, the sampling rate is consequently altered. If strong adsorbents are used, changes on sampling rates due to temperature effect can be described more simply by the changes caused on the diffusion coefficient. Nevertheless, in those cases when a porous medium is present in the diffusion path, the regime of diffusion controls the final effect of the temperature on the sampling rate.

The current contribution describes an improved correlation for sampling rates and temperature taking into account the diffusion mechanism through a porous medium. The proposed equation is also tested on the correlation of sampling rates determined for benzene, toluene and p-xylene in the range of 5 to 40 degrees Celsius in a radial diffusion sampler with active charcoal as adsorbent. bent.

Additional information

Authors: PÉREZ BALLESTA P, JRC, Institute for Environment and Sustainability, Ispra (IT);BALDAN A, JRC, Institute for Environment and Sustainability, Ispra (IT);CONNOLLY R, JRC, Institute for Environment and Sustainability, Ispra (IT)
Bibliographic Reference: An oral report given at: The Arctic Workshop, Brussels (BE), 25-27 October 2001
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