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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 MarineGrunnkart fellesDatakatalog Natur Forurensning Kyst og fiskeri Fjorder og kystnære havområder langs norskekysten Barentshavet Norskehavet Svalbard Norge Norge Mareano Kjemi Bunn Miljøforhold Persistente organiske miljøgifter Hydrokarboner Forurensning Sediment Marine Grunnkart i Kystsonen infoMapAccessService
Map layers showing trans-nonachlor (TNC) concentrations (µg/kg dry weight) in surface sediment samples collected on annual MAREANO cruises. These have been ongoing since 2006. Data from monitoring cruises in the Barents Sea in 2003-2004, as well as for some stations in the pilot project "Marine Ground Map in the Coastal Zone" in 2020-21, are also included in the data set.

TNC is a type of persistent organic chemicals (English: Persistent Organic Pollutants, POPs). Common to all POPs is that they break down very slowly in nature and can therefore be preserved in sediments for a long time; that they can be taken up by marine organisms and accumulate; and that they have negative effects on marine organisms. The vast majority of POPs are man-made and there are no natural sources for these, while some POPs can also be formed in nature, but human activity is still usually the main source of these substances in the marine environment. They can end up in the marine environment as a result of emissions, general use and diffuse inputs. They can be transported across the globe, far from their original source, by both air, water (rivers, ocean currents and groundwater) and living organisms before finally ending up in marine sediments. The sediments may contain concentrated levels of these compounds.

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 - Trans-nonaklor levels WMS