Distribution of individual chlorobiphenyls (PCB) in solution and suspension in the Baltic Sea

摘要: Single and multidimensional GC-ECD techniques were applied to determine individual chlorobiphenyls (CBs) in solution suspended particles the Baltic Sea (some data also obtained for adjacent German Bight North Sea). Large volumes (up 1100 dm3) analysed transects November 1988 1989 spring 1991. Salinity temperature measured continuously along sampling tracks all three cruises; nutrients pH only latter two cruises. Concentrations of CBs sub- low pg dm−3 range (detection limit being 0.05 dm−3), their sum between 2 237 dm−3. These concentrations are considerably lower than previously reported data. This is mainly result elimination contamination interference problems sampling, clean-up procedures. It may partly reflect reduction production use PCBs last decade. The highest originated from local sources Belt Gulf Finland. Regional differences found compositions CB mixtures solution. The lowest areas periods plankton (spring 1991), with ΣCB 14 dm−3. The showed regional each cruise. could be interpreted terms mixing different water bodies. classification on basis these patterns agreed well distinction bodies T-S diagrams hydrochemical data. Concentrations suspension generally 0.1–0.5 dm−3, those (ΣCB) 4 6 during autumn cruises. Extremely high values Sea-Kattegat area 1991 589 up 2859 ΣCB). probably reflects uptake into particulates a bloom. Primary effectively remove column sediments. amounts presently stored sediments exceed by several orders magnitude. The differed suspension. relations log K′d (apparent particle/water partition coefficient) Kow (octanol-water distribution suggest existence (quasi-)equilibrium conditions autumn. Deviations this behaviour arise biological activity spring. The contribution toxic congeners was dominated mono- di-ortho-Cl substituted derivatives most non-ortho-Cl CBs. toxicity 0.01 12fg TEQs (TCDD equivalents). CBs-77, -118, -105 -156 had largest contributions TEQs.