title: Comparison of two extraction methods independently developed on two conceptually different automated supercritical fluid extraction systems for the determination of polychlorinated biphenyls in sediments.
abstract: Two extraction methods that independently have been developed on conceptually different automated supercritical fluid extraction systems, ISCO SFX 3560 (syringe pump and liquid trapping) and Hewlett-Packard 7680T SFE (reciprocating pump and solid-phase trapping), were compared for the extraction of polychlorinated biphenyls from two Swedish sediments. The results demonstrated that the high-temperature ISCO method in some cases yields a more exhaustive extraction, but also less clean extracts due to co-extraction of unwanted matrix components which are all present in the trapping solvent. The medium-temperature Hewlett-Packard method may sometimes cause problems with quantitative recoveries, but on the other hand it yields very clean extracts due to the extra selectivity resulting from collection on a solid-phase trap.
authors.affiliation: Department of Analytical Chemistry, Lund University, Sweden. tobias.nilsson@analykem.lu.se
authors.forename: T
authors.initials: T
authors.lastname: Nilsson
authors.forename: E
authors.initials: E
authors.lastname: Björklund
authors.forename: S
authors.initials: S
authors.lastname: Bøwadt
mesh_terms: D001331:Automation; D002845:Chromatography / Q000379:methods*; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D012015:Reference Standards; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D012989:Soil Pollutants; D011078:Polychlorinated Biphenyls