HRGC separations of 160 chlorobiphenyls in technical mixtures on four polar narrow-bore columns
The separation of 160 chlorobiphenyl (CB) congeners from technical polychlorinated biphenyl (PCB) mixtures was investigated on four narrow-bore, fused silica gas chromatography (CG) columns with high temperature resistant polar stationary phases: 15 % diphenyl dimethylsiloxane (0.20 micron SIL-13, 50 m x 0.25 mm), 50 % diphenyl dimethylsiloxane (0.25 micron DB-17, 60 m x 0.25 mm), a series combination of 5 % diphenyl dimethylsiloxane (0.25 micron SIL-8, 25 m x 0.25 mm) with 1,10-dicarbacloso-dodecarborane dimethylsiloxane (0.1 micron HT-5, 25 m x 0.2 mm) and a 70 % cyanopropyl silphenylene dimethylsiloxane copolymer (0.25 micron BPX-70, 50 m x 0.22 mm). Technical PCB mixtures (Aroclors) and authentic standards (totally 149 CBs) were injected on the narrow-bore columns and analysed by GC-ECD and GC-MS. Structural principles for retention of CBs and the retention mechanism of diphenyl and cyanopropyl in the stationary phase are discussed. SIL-13 proved to be an interesting alternative to the widely used SE54 type columns, DB-17 showed a significantly changed elution order and seems the best choice of column together with SIL-8/HT-5 for parallel analysis of CB congeners. A total of 144 CBs in technical mixtures can be analysed free of interference from other CBs employing these two columns. Too many CB congeners co-eluted on BPX70 for ths column to be useful in routine analysis of CBs.
Bibliographic Reference: Article: International Journal of Environmental Analytical Chemistry, Vol. 56 (1994) pp. 87-107
Record Number: 199510545 / Last updated on: 1995-04-21
Original language: en
Available languages: en