Determination of contributions of different types of solute-sorbent interactions in gas-adsorption chromatography by linear regression of adsorption energies

Abstract The gas chromatographic adsorption energies of 30 sorbates were processed by using descriptors which define dispersion, orientation and donor—acceptor interactions. Hydrogen treated, thermally graphitized carbon black, barium sulphate and a porous polymer of medium polarity were used as sorbents. A four-variable regression equation for all sorbents with R ≈ 0.97 and a relative standard deviation of ca. 5% was developed. The importance of the different solute—sorbent interactions (SSI) for each sorbent studied is discussed. The contributions of the SSI to the total adsorption energy of Rohrschneider's substances for the sorbents were calculated.