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Abstract
The thorough study on physico-chemical properties of carbon sorbents belonging to different groups of sorbents—activated charcoal, molecular sieves—Carbosieve S-III, Carboxen 1000; porous carbons—Carb I, Carb II; graphitized carbon blacks—Carbopack B. Carbotrap, Carbotrap C is presented in this paper. Measurements of the surface area, pore size and volume on the base of adsorption isotherms and pore distribution measurements, measurement of particle size and evaluation of particle shape by microscopy, searching the sorbent morphology by scanning electron microscopy, evaluation of the quality of surface by 1H MAS-and 13C MAS solid-state NMR spectroscopy and elemental analysis were employed as means for the sorbent materials characterisation.
Gas-solid chromatography (GSC) has been utilised to determine the specific retention volumes at 20°C, Vg(20°C), and isosteric heat of adsorption, qst, for organic compounds belonging to various groups-n-alkanes, aromatics, halocarbons, oxygenated compounds. On the base of Vg(20°C) and qst the advantages and drawbacks of porous carbon sorbents in contrary to commercial kinds of sorbents for preconcentration purposes of volatile organic compounds in environmental analysis are discussed.