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Sedimentprøver for kjemiske analyser er samlet inn på tokt med Havforskningsinstituttets egne fartøy i regi av flere forskjellige prosjekter, inkludert MAREANO-programmet. Multicorer, boksprøvetaker og Van Veen grabb er brukt til prøvetaking. De fleste organiske miljøgifter er analysert på Havforskningsinstituttets kjemilaboratorier. Enkelte nye organiske miljøgifter analyseres av Norsk Institutt for Luftforskning (NILU). Resultater av alle miljøgeokjemiske undersøkelser er samlet i en felles database sammen med uorganiske miljøgifter og sedimentkarakteristikk fra Norges geologiske undersøkelse (NGU). Datasettet egner seg til bruk i målestokk 500 000 - 10 000 000.
Geologi Habitater og biotoper Havområder Mareano MarineGrunnkart fellesDatakatalog Natur Kyst og fiskeri Forurensning Fjorder og kystnære havområder langs norskekysten Barentshavet Norskehavet Svalbard Norge Norge Mareano Chemistry Seabed enviroment Persistent organic poison Hydro carbons pollution Sediment Marine Grunnkart i Kystsonen infoMapAccessService
Map layer showing concentrations of the fully brominated congener BDE-209, in µg/kg dry weight in samples of surface sediments collected on annual MAREANO cruises. These have been ongoing since 2006. Data from samples for some stations in the pilot project "Marine Ground Map in the Coastal Zone" in 2020-21 is also included in the data set.

BDE-209 joins the rest of the PBDE substances in the category of persistent organic pollutants (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 - Levels of BDE-209 WMS