Abstract
The adsorption characteristics of several adsorbate-adsorbent systems were analysed to obtain a better understanding of the parameters involved in the selection of adequate sorbents for diffusive sampling. Nitrogen adsorption was used to establish the porous texture of the adsorbent. Gas-solid chromatography and immersion calorimetry were used for studying the adsorption interactions of benzene and n-hexane with the adsorbent surfaces. In this way, specific retention volumes, isostatic heats of adsorption at low surface coverage and immersion heats for benzene and n-hexane were determined. The results obtained showed the important role of micropore volumes for a strong interaction of the adsorbents with the adsorbates. Chromosorb 106 and activated carbon were the best adsorbents for benzene and n-hexane when tube-type samplers and thermal desorption-gas chromatography were used.
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