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Selectivity Equivalence of Poly(ethylene Glycol) Stationary Phases for Gas Chromatography by Colin F. Poole; Qinglin Li; Waruna Kiridena; Wladyslaw W. Koziol is a Chemistry article available to read on EtoBox.
What is Selectivity Equivalence of Poly(ethylene Glycol) Stationary Phases for Gas Chromatography about?
The solvation parameter model is used to study differences in selectivity for poly(ethylene glycol) stationary phases for packed column (Carbowax 20M) and fused-silica, open-tubular column (HP-20M, AT-Wax, HP-INNOWax and DB-FFAP) gas chromatography. All phases are dipolar, strongly hydrogen-bond basic with no hydrogen-bond acidity and of moderate cohesion. No two phases are exactly alike, however, and selectivity differences identified with cavity formation and dispersion interactions, n-and p-electron pair interactions, dipole-type interactions and hydrogen-bond interactions are quantified by differences in the system constants at a fixed temperature where retention occurs solely by gas-liquid partitioning. The system constants vary linearly with temperature over the range 60-1408C (except for n-and p-electron pair interactions which are temperature invariant) facilitating a general comparison of the importance of temperature on selectivity differences for compared phases. From a mechanistic point of view it is demonstrated that selectivity differences can result from chemical differences between the poly(ethylene glycol) stationary phases and from differences in the relative cont
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- Author
- Colin F. Poole; Qinglin Li; Waruna Kiridena; Wladyslaw W. Koziol
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 1873-3778)
- Published
- 2000
- Language
- EN
- Field
- Chemistry (Physical Sciences)