Selectivity equivalence of poly(ethylene glycol) stationary phases for gas chromatography

作者: Colin F. Poole , Qinglin Li , Waruna Kiridena , Wladyslaw W. Koziol

DOI: 10.1016/S0021-9673(00)00829-3

关键词:

摘要: Abstract The solvation parameter model is used to study differences in selectivity for poly(ethylene glycol) stationary phases packed column (Carbowax 20M) and fused-silica, open-tubular (HP-20M, AT-Wax, HP-INNOWax DB-FFAP) gas chromatography. All are dipolar, strongly hydrogen-bond basic with no acidity of moderate cohesion. No two exactly alike, however, identified cavity formation dispersion interactions, n- π-electron pair dipole-type interactions quantified by the system constants at a fixed temperature where retention occurs solely gas–liquid partitioning. vary linearly over range 60–140°C (except which invariant) facilitating general comparison importance on compared phases. From mechanistic point view it demonstrated that can result from chemical between relative contribution interfacial adsorption mechanism. latter depends both properties solute characteristics.

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