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The distribution of selected chlorinated microcontaminants in Baltic waters, 1992 to 1994

Die Verteilugn chlorierter Mikroschadstoffe im Wasser der Ostsee, 1992 bis 1994

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Summary

Investigations on the distribution of selected chlorinated hydrocarbons and organochlorine pesticides were carried out in the waterbody of the Baltic Sea with special focus on the coastal waters of Mecklenburg-Vorpommern between 1992 and 1994. The contaminations during sampling and blank measurements of the extracting medium were investigated. The organochlorine compounds including the individual isomers of hexachlorocyclohexane (HCH), individual congeners of chlorinated biphenyls (CBs), dichlorodiphenyl-trichloroethane (DDT) and some of its metabolites were analysed by gaschromatographic techniques (HRGC-ECD/ECD). In Baltic waters the highest concentrations in the range between 200 and 2000 pg dm−3 were found for HCH isomers. Clear regional variations exist only for γ-HCH. In contrast, α-HCH is more homogeneously distributed in Baltic surface waters. Seasonal variations for both HCH isomers were observed. The concentrations of the lower water soluble individual CB congeners ranged between <5 and 175 pg dm−3. The regional distribution of CBs in Baltic Sea water showed only weak gradients. The nonortho-Cl substituted CBs were below the detection limit of 5 pg dm−3. The concentrations of DDTs including metabolites were below the limit of detection of 5 pg dm−3 up to 150 pg dm−3.

Zusammenfassung

Es wurden Untersuchungen zur Verteilung ausgewählter chlorierter Kohlenwasserstoffe und Organochlorpestitzide im Wasserkörper der Ostsee, mit Schwwerpuunkt auf den Küstengewässern Mecklenburg-Vorpommern, in den Jahren 1992 bis 1994 durchgeführt. Die Kontamination während der Probenahme und Blindwertmessungen des Extraktionsmittels wurden untersucht. Die chlororganischen Verbindungen, z.B. die verschhiedenen Isomere des hexachlorcyclohexans (HCH), einzelne Congenere der chlorierten Biphenyle (CB), Dichlordiphenyltrichlorethan (DDT) und einige Metaboliten wurde mit Hilfe gaschromatischer Methoden (HRGC-ECD/ECD) bestimmt. Die höchsten Konzentrationen im Ostseewasser, zwischen 200 und 2000 pg dm−3, wurden bei HCH-Isomeren gemessen. Eindeutige regionale Unterschiede wurden nur bei γ-HCH festgestellt. Dagegen ist α-HCH gleichmäßiger im Oberflächenwasser der Ostsee verteilt. Bei beiden HCH-Isomere wurden jahreszeitliche Schwankungen festgestellt. Die weniger wasserlöslichen CB-Congenere lagen in Konzentrationen von <5 bis 175 pg dm−3 vor. Die regionale CB-Verteilung im Ostseewasser zeigte nur schwache Gradienten. Die nicht-Ortho-Cl-substituierten CB lagen unterhalb der Nachweisgrenze von 5 pg dm−3. Die Konzentrationen von DDT und DDT-Metaboliten lagen unterhalb der Nachweisgrenze von 5 pg dm−3 bis 150 pg dm−3.

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Correspondence to Dirk Dannenberger.

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Dannenberger, D., Lerz, A. The distribution of selected chlorinated microcontaminants in Baltic waters, 1992 to 1994. Deutsche Hydrographische Zeitschrift 47, 301–312 (1995). https://doi.org/10.1007/BF02737790

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