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  • Elimination of high-boiling impurities interfering with the quantification of polychlorinated biphenyls (PCBs) and organochlorinated pesticides (OCPs) from the extracts of sediment samples


During the development of an analytical procedure aimed to assess the polychlorinated biphenyl (PCB) concentration and the concentration of 8 organochlorinated pesticides (alpha-HCH, beta-HCH, gamma-HCH, QCB, HCB, pp'-DDT, pp'-DDE and pp'-DDD) in the sediments of an Italian artificial drinking water reservoir it was found that some high-boiling co-extractives withstanding the clean-up step interfered with the gas-chromatographic quantification of the contaminants by lowering the peak resolution and by rapidly and irreversibly damaging the fused-silica capillary column. Due to their relatively low polarity these impurities could be eliminated by discarding the first 15 ml of solvent eluting from the chromatographic column used to separate pp'-DDT, pp'-DDD and the HCH-isomers from the remaining micropollutants. The partial loss of QCB and HCB which was associated with the discarding of the first part of the eluant was corrected for by multiplying the analytically determined concentrations by an appropriate correction factor.

Additional information

Authors: KALAJZIC T, JRC Ispra (IT);MUNTAU H, JRC Ispra (IT);BIANCHI M, Ecoconsult, Gavirate (IT);KETTRUP A, Technische Universität München, Freising Weihenstephan (DE)
Bibliographic Reference: Article: Journal of Chromatography
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