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Chewe, D, 1997. Analytical methods for the congener specific determination of polychlorinated biphenyls in environmental and food samples. PhD, Nottingham Trent University.
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Abstract
A method for the on-line extraction, clean-up, fractionation and congener specific determination of ortho- and non-ortho-PCBs by gas chromatography-mass spectrometry was developed and validated. The chromatographic clean-up and fractionation of PCBs was carried out on a silica multilayer column coupled to a supported carbon column. A solvent elution scheme for the efficient separation of ortho- and non-ortho-substituted polychlorinated biphenyls, in two different fractions was developed. Detection was by gas chromatography-mass spectrometry (GC-MS). The method was applied to the analysis of fruit and vegetable samples obtained from sites in South Wales including the vicinity of a chemical incinerator. In all cases where PCBs were detected, levels were <0.2 μg kg-1 Concentrations expressed in toxic equivalents (TEQs) showed that the most important contributor to the total TEQ was the non-ortho-PCB-126.
On-line high performance liquid chromatography-gas chromatography (HPLC-GC) is described for the concurrent determination of ortho- and non-ortho-substituted polychlorinated biphenyls (PCBs) in commercial mixture and soil samples. A porous graphitic carbon column eluted with hexane:toluene and toluene was used for the HPLC separation of ortho- and non-ortho-PCBs. Fractions were transferred from the HPLC to the GC column. Cryogenic cold trapping was used for analyte focusing at the head of the GC analytical column. Ortho- and non-ortho-PCB congeners were determined using electron capture and mass spectrometric detection.
| Item Type: | Thesis |
|---|---|
| Creators: | Chewe, D. |
| Date: | 1997 |
| ISBN: | 9781369313055 |
| Identifiers: | Number Type PQ10183007 Other |
| Divisions: | Schools > School of Science and Technology |
| Record created by: | Jeremy Silvester |
| Date Added: | 28 Aug 2020 14:16 |
| Last Modified: | 14 Jun 2023 10:57 |
| URI: | https://irep.ntu.ac.uk/id/eprint/40588 |
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