NDLI: Release of dissolved trace metals and organic contaminants during deep water disposal of contaminated sediments from Oslo harbour, Norway

Content Provider	Springer Nature Link
Author	Schaanning, Morten Thorne Harman, Christopher Staalstrøm, André
Copyright Year	2011
Abstract	The current study was conducted in order to assess the release of dissolved contaminants from sediment relocation works in Oslo harbour, Norway, whilst operations were being carried out, and to assess the potential for spreading into the wider fjord area.This was achieved by comparing the concentration of metals and organic contaminants in the vicinity of the disposal site, and at strategic locations in the adjacent fjord area. In total, 14 stations were chosen, with passive sampling devices, diffusive gradients in thin films for metals and semipermeable membrane devices for organic compounds, deployed at various depths at each station for a period of 1 month.The highest concentrations were generally found closer to the harbour area where trace metals and organic contaminants are supplied from several sources including river discharges and old, contaminated sediments. Near the deposition site, the concentrations of polychlorinated biphenyls were low and the concentration gradients for Cd, Zn and Cu indicated removal of these metals from the water column, probably due to association with sulphides present at the deposition site or in the discharged sediments. Elevated concentrations of Pb and polycyclic aromatic hydrocarbons (PAHs) revealed that the disposal acted as a source of these compounds, but maximum concentrations were similar to or less than those predicted before the deposition begun. The estimated vertical transport and spreading to areas outside of the semi-enclosed sill basin was negligible.Strictly, the validity of the results presented here are limited to a 1-month period of the disposal operations which lasted nearly 3 years. During this period, release of contaminants was compound-specific, but even for the most labile PAHs and Pb, the release appeared to be in the same order of magnitude or smaller than the release from other local sources not limited in time to the duration of the remediation operation.
Starting Page	1477
Ending Page	1489
Page Count	13
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	11
Issue Number	8
e-ISSN	16147480
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-10-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	DGT Heavy metals Offshore disposal Organic contaminants Oslofjord SPMD Environmental Physics Environment Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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