title: Classification and comparison of capillary columns by determination of the solution enthalpy of polar and non polar probes.
abstract: The behaviour and separation characteristics of capillary columns containing different stationary phases (bonded methyl- and methylphenylsiloxanes and polyglycols, and carbon layer and porous polymer) were classified and compared by measuring the values of the solution enthalpy DeltaHs of n-alkanes and 1-alcohols at various temperatures. The difference in DeltaHs values between straight-chain 1-alcohols and n-alkanes with the same number of carbon atom (DeltaDeltaHs) does not change with changing temperature when gas-liquid partition stationary phases are used, but depends on the column composition and polarity and therefore permits to evaluate the influence of polarity on the solute-solvent interaction. The trend of the DeltaDeltaHs values is correlated with that of the DeltaC parameter and with the McReynolds' polarity constants.
authors.affiliation: University of Genova, Dipartimento di Chimica e Chimica Industriale, Via Dodecaneso 31, I-16146 Genova, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Vezzani
authors.forename: P
authors.initials: P
authors.lastname: Moretti
authors.forename: G
authors.initials: G
authors.lastname: Castello
mesh_terms: D000327:Adsorption; D002845:Chromatography / Q000295:instrumentation*; D011092:Polyethylene Glycols / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry; D012997:Solvents; D013816:Thermodynamics
chemical_list: D012833:Siloxanes; D012997:Solvents; D011092:Polyethylene Glycols