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  • 1985-1989  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Ocean dynamics 41 (1988), S. 1-21 
    ISSN: 1616-7228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Es wird über die Belastung von 101 flächendeckend beprobten Nordseesedimenten mit polychlorierten Biphenylen (24 Einzelisomere), p, p′-DDE, HCB, α-HCH und Lindan (γ-HCH) berichtet. Die PCB-Muster der im Frühsommer 1986 gezogenen Proben unterscheiden sich hinsichtlich Gebiete mit Nettosedimentation und der zentralen Nordsee: in den Mustern der Sedimente des Kattegats, des Skagerraks, der Norwegischen Rinne und der inneren Deutschen Bucht sind hochchlorierte Isomere, in der zentralen Nordsee niederchlorierte Isomere dominant. Geographische Trends in der Schadstoffbelastung werden auf der Basis des Trockengewichts, sowie normiert auf den Gehalt des Sediments an organischer Substanz aufgezeigt. Sedimente der Norwegischen Küste und der inneren Deutschen Bucht sind hoch mit PCBs, p, p′-DDE und HCB belastet. Die Ems emittiert HCB, die Ostsee p, p′-DDE in die Nordsee; Lindan und α-HCH zeigen keine ausgeprägten Gradienten.
    Abstract: Résumé La contamination des sédiments de la mer du Nord avec du PCB — (somme de 24 composants différents), p, p′-DDE, HCB, α-HCH et Lindane (γ-HCH) fut déterminée dans 101 échantillons pris au début de l'été 1986. Les types de composants individuels de PCB dans les sédiments sont différents selon qu'ils proviennent de zones de déblais ou de stations offshore. Les prélèvements en provenance de Kattegat/Skagerrak/Norvegian Channel comme ceux de la baie intérieure allemande accusent des montants plus élevés de composants hautement chlorés que les prélèvements provenant du centre de la mer du Nord. Les différences géographiques dans la contamination organochlorée ont été démontrées sur la base de sédiments secs et du volume total de la matière organique. Les concentrations de ΣPCB, p, p′-DDE et HCB reflètent les zones de dépôts récents de matière suspendue dans la mer du Nord. L'estuaire Ems-Dollard est une source de pollution HCB pour la région sud de la mer du Nord; le p, p′-DDE associé aux matières suspendues en provenance de la mer Baltique s'accumule probablement dans le Kattegat/Skagerrak/Norvegian channel. Les concentrations de Lindane et de α-HCH n'ont pas montré de variation significative dans la zone étudiée.
    Notes: Summary The contamination of North Sea sediments with PCB (as the sum of concentrations of 24 individual components), p, p′-DDE, HCB, α-HCH and Lindane (γ-HCH) was determined in 101 samples taken in early summer 1986. The patterns of individual PCB congeners in the sediments differ between depositional areas and offshore stations: samples from the Kattegat/Skagerrak/Norwegian channel as well as the inner German Bight show higher amounts of highly chlorinated congeners than samples from the central North Sea. The geographical differences in organochlorine contamination were demonstrated on the basis of dry sediments and the content of total organic matter. Concentrations of ΣPCB, p, p′-DDE and HCB reflect the areas of recent deposition of suspended matter in the North Sea. The Ems-Dollard estuary is a source of HCB pollution to the southern North Sea, p, p′-DDE associated to suspended matter from the Baltic Sea presumably accumulates in the Kattegat/Skagerrak/Norwegian channel. Concentrations of Lindane and α-HCH showed only slight gradients or even none in the area investigated.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary It is demonstrated by simulated environmental factors that after the application of petroleum onto a water surface, alterations in the distribution pattern are primarily caused by evaporation. During 8 h of analysis, it has been shown that evident loss by evaporation occurs especially for low-molecular n-alkanes, where the evaporating velocity is dependent on the film thickness, water temperature and wind velocity. Quantitatively, the concentration decrease of n-alkanes, nonane to pentadecane as well as pristane was determined by capillary gas chromatography with flame ionization detection at different periods of time, different water temperature and film thickness. A simple, rapid and cost-effective method for column chromatographic separation of low-boiling petroleum is also presented. By means of this method, it is possible to separate aliphatic, mono-, di- and polyaromatics from petroleum. The following gas chromatographic separation of the three fractions is simplified by removal of the non-volatile components.
    Type of Medium: Electronic Resource
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