title: Evaluation of the separation characteristics of application-specific (pesticides and dioxins) open-tubular columns for gas chromatography.
abstract: The solvation parameter model is used to characterize the retention properties of four application-specific open-tubular columns (Rtx-CLPesticides, Rtx-OPPesticides, Rtx-Dioxin and Rtx-Dioxin2) at five equally spaced temperatures over the range 60-140 degrees C. Cluster analysis is used to compare the system constants to a database of forty open-tubular columns characterized according to the same method. System constants differences and retention factor correlation plots are then used to determine selectivity differences between the application-specific columns and their nearest neighbors identified by cluster analysis. The Rtx-CLPesticides and Rtx-OPPesticides columns are shown to belong to the selectivity group containing poly(dimethylmethyltrifluoroprpylsiloxane) stationary phases with Rtx-OPPesticides having a similar selectivity to a poly(dimethylmethyltrifluoropropylsiloxane) stationary phase containing 20% methyltrifluoropropylsiloxane monomer (DB-200) and Rtx-CLPesticides separation properties for a stationary phase containing less than 20% methyltrifluoropropylsiloxane monomer. The Rtx-Dioxin and Rtx-Dioxin2 columns are located in the selectivity group dominated by the poly(dimethyldiphenylsiloxane) stationary phases containing less than 20% diphenylsiloxane monomer. The Rtx-Dioxin and Rtx-Dioxin2 columns are shown to be selectivity equivalent to a (5% phenyl) carborane-siloxane copolymer stationary phase (Stx-500) and a second generation silarylene-siloxane copolymer stationary phase containing dimethylsiloxane and diphenylsiloxane monomers (DB-XLB), respectively.
authors.affiliation: Flint Group, North America, Analytical & Physical Sciences Laboratory, 4600 Arrowhead Drive, Ann Arbor, MI 48105, USA.
authors.forename: Waruna
authors.initials: W
authors.lastname: Kiridena
authors.forename: Colleen
authors.initials: C
authors.lastname: DeKay
authors.forename: Cheryl C
authors.initials: CC
authors.lastname: Patchett
authors.forename: Wladyslaw W
authors.initials: WW
authors.lastname: Koziol
authors.forename: Jing
authors.initials: J
authors.lastname: Qian
authors.forename: Colin F
authors.initials: CF
authors.lastname: Poole
mesh_terms: D002849:Chromatography, Gas / Q000295:instrumentation*; D016000:Cluster Analysis; D004147:Dioxins / Q000302:isolation & purification*; D010575:Pesticides / Q000302:isolation & purification*; D011108:Polymers / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry
chemical_list: D004147:Dioxins; D010575:Pesticides; D011108:Polymers; D012833:Siloxanes