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Sediment samples for chemical analyzes have been collected on voyages with the Norwegian Institute of Marine Research's own vessels under the auspices of several different projects, including the MAREANO programme. Multicorer, box sampler and Van Veen grab are used for sampling. Most organic pollutants have been analyzed at the Norwegian Institute of Marine Research's chemistry laboratories. Certain new organic pollutants are analyzed by the Norwegian Institute for Air Research (NILU). Results of all environmental geochemical investigations are collected in a common database together with inorganic pollutants and sediment characteristics from the Geological Survey of Norway (NGU). The data set is suitable for use on a scale of 500,000 - 10,000,000.
Geologi Habitater og biotoper Havområder Mareano Natur Kyst og fiskeri Forurensning Fjorder og kystnære havområder langs norskekysten Barentshavet Norskehavet Svalbard Norge Norge Mareano Chemistry Seabed enviroment Persistent organic poison Hydro carbon pollution Sediment infoMapAccessService
Map layer showing concentrations of Dekloran (µg/kg dry weight) in samples of surface sediments collected on annual MAREANO cruises since 2006.

Dechloranes are very persistent halogenated pollutants that are used as flame retardants, or occur as impurities in the main product, Dechlorane Plus (English: Dechlorane Plus). environmental problem. There is a lack of regulation, nationally and internationally, for most of these substances, and it is therefore important to be able to demonstrate the extent of the problem as a basis for achieving proper use and handling of the substances. The problem is greatest primarily in stressed coastal areas near ports and industrial areas, but the open sea can also be affected by the new environmental toxins through long-hauled inputs. The Norwegian Environment Agency has condition classes for some of these compounds.

Since 2018, the MAREANO program has collected data on declorans.

The sediment samples for geochemical analyzes are taken primarily from areas with fine-grained sediments both in open marine depositional environments and coastal sea areas. Sample density varies depending on location. There is a greater sample density in fjords and coastal areas, while in open sea areas the sample density is lower.
Organic environmental poisons in marine sediments - Levels of Dekloran WMS