Interference from 2,3,5,6-3′,4′-Hexachlorobiphenyl (CB 163) in the Determination of 2,3,4-2′,4′,5′-Hexachlorobiphenyl (CB 138) in Environmental and Technical Samples

Comparison of the in Situ and Desorption Sediment−Water Partitioning of Polycyclic Aromatic Hydrocarbons and Polychlorinated Biphenyls

“…We thank Dr. Søren S. Bowat, University of North Dakota, for bringing to our attention an error of statement in our paper, providing references that we failed to find and cite ( − ), and also providing copies of two excellent recent reviews on chlorobiphenyl congener analyses ( , ). The last sentence of the Materials and Methods section should read: The congeners reported here (CB101, CB138) may have some interference from coeluting congeners; CB 84 interfering with CB101 (up to 15% CB84 relative to CB101 in some PCB mixtures and environmental samples) and CBs 163 and 164 interfering with CB138 (up to 35−40% of CB163+164 in some PCB mixtures and environmental samples).…”

Determination of Chlorinated Hydrocarbons in Marine Sediments at the Part-per-Trillion Level with Supercritical Fluid Extraction

“…Several authors separated nearly all PCBs of a technical mixture (chlophen or arochlor), but the PCBs are only a small part of the extractable chlorinated compounds in environmental samples. For example, PCB 138 and PCB 163 are not separated on a DB5 column (retention time 54.40 and 54.34 min, respectively) . They are properly separated on the HT8 column (62.91 and 62.58 min, respectively), but there the PCB 163 coelutes with p , p‘ -DDT (62.58 and 62.51 min, respectively), which can be seen from Table , where the determined values of p , p‘ -DDT on the HT8 column are too high.…”

“…The extracts of the reference material were additionally analyzed on a second gas chromatograph (HP 5890 Series II with on-column injector), where a column of different polarity (DB5, 50 m × 0.32 mm i.d. ; film thickness 0.25 μm; J & W, Folsom CA) was installed in order to achieve coelution-free performance of each analyte. − Use of two columns of different polarity provides a higher analytical correctness. Therefore, the prescription for the participants of the intercomparison study included the analyses of extracts with two chromatographic columns.…”

Optimization of SFE for the Determination of Chlorinated Hydrocarbons at the Part-per-Trillion Level

“…The extracts were analyzed by gas chromatography on a HP 5890 Series II GC (Hewlett-Packard, Hamburg, Germany) equipped with an electron capture detector, a split/splitless injection port, and an autosampler. A series link of an HT8 and a BPX 5 column , (both 25 m × 0.22 mm i.d. ; film thickness 0.25 μm; Scientific Glass Engineering, Weiterstadt, Germany) was used for analysis of all extracts.…”