Classification and comparison of capillary columns by determination of the solution enthalpy of polar and non polar probes.
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.
Vezzani
S
S
University of Genova, Dipartimento di Chimica e Chimica Industriale, Via Dodecaneso 31, I-16146 Genova, Italy.
Moretti
P
P
Castello
G
G
D000327:Adsorption; D002845:Chromatography / Q000295:instrumentation*; D011092:Polyethylene Glycols / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry; D012997:Solvents; D013816:Thermodynamics
D012833:Siloxanes; D012997:Solvents; D011092:Polyethylene Glycols