Liquid crystalline polysiloxane polymer as stationary phase in gas chromatography capillary column for the separation of dioxin/furan compounds

A side-chain liquid crystalline polysiloxane polymer (PS3DBDE1) with high p urity and high isotropic transition temperature served as a stationary phas e in an attempt to chromatographize the dioxin/furan compounds. The polymer was coated on the inner surface of a 0.25 mm I.D. capillary column by usin g the static coating method, forming a film with a thickness of d(f)approxi mate to0.25 mum. A commercial standard solution (US EPA 1613 standard solut ion 1613CS4) containing polychlorinated dibenzo-p-dioxins (PCDDs) and polyc hlorinated dibenzofurans (PCDFs) was used to test the chromatographic behav ior of the laboratory-made capillary column. Two commercial capillary colum ns HP-5MS (Hewlett-Packard) and RTX-5MS (RTX) were chosen to compare their chromatographic behavior. The results show that by the use of PS3DBDE1 the isomeric pair compounds 1,2,3,4-TeCDD vs. 2,3,7,8-TeCDD and 1,2,3,4,7,8-HxC DD vs. 1,2,3,6,7,8-HxCDD and the same substituted-chlorine number compounds l,2,3,4,6,7,8-HpCDF vs. 1,2,3,4,6,7,8-HpCDD and 1,2,3,4,6,7,8,9-OCDD vs. I ,2,3,4,6,7,8,9-OCDF had higher resolution than HP-5MS and RTX-5MS as sugges ted by the column makers. (C) 2001 Published by Elsevier Science B.V.