e4811c38-6c6f-4a99-8a26-654cfad18e41 Aarhus University, Department of Bioscience, Marine Ecology Roskilde 399 Frederiksborgvej P.O. Box 358 Roskilde DK-4000 Denmark http://bios.au.dk/en/ web site 2026-04-02T00:00:00 ISO 19115:2003/19139 1.0 WGS 1984 Microplastic-like particles in sediments from Danish waters 2015 2016-01-01 2020-11-16 2021-09-20 e4811c38-6c6f-4a99-8a26-654cfad18e41 Contents and composition of microplastic-like particles have been analysed in ten sediment samples from the Danish part of the open North Sea and in the Inner Danish waters in 2015. The contents of microplastic-like particles in the size range 100-5000 µm were determined to be in the range of 192-3511 particles per kg dry weight sediment, dominated by blue and black coloured particles, mainly as fibres, and particle sizes < 300 µm were dominating. Aarhus University,Danish Centre for Environment and Energy Frederiksborgvej 399 Postboks 358 Roskilde DK_4000 Denmark http://dce.au.dk/en/ web site Aarhus University, Department of Bioscience, Marine Ecology Roskilde 399 Frederiksborgvej P.O. Box 358 Roskilde DK-4000 Denmark http://bios.au.dk/en/ web site Oceanographic geographical features GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Skagerrak North Sea Baltic Sea The Sound Storebaelt Lillebaelt Kattegat Wadden Sea SeaVoX salt and fresh water body gazetteer 2024-01-15 SeaVoX salt and fresh water body gazetteer Rock and sediment physical properties SeaDataNet Agreed Parameter Groups 2023-07-04 SeaDataNet Agreed Parameter Groups unconsolidated sediment corers SeaDataNet device categories 2024-01-16 SeaDataNet device categories Unspecified box corer SeaVoX Device Catalogue 2024-01-29 SeaVoX Device Catalogue Dissolved organic carbon concentrations in sediment pore waters Micro-litter in sediments Sediment water content, porosity and surface area SeaDataNet Parameter Discovery Vocabulary 2023-12-12 SeaDataNet Parameter Discovery Vocabulary CRUISE SUMMARY REPORT INVENTORY (CSR) 2023-10-02 airship SeaVoX Platform Categories 2024-01-16 SeaVoX Platform Categories ICES Platform Codes 2024-01-16 ICES Platform Codes EUROPEAN DIRECTORY OF MARINE ENVIRONMENTAL RESEARCH PROJECTS (EDMERP) 2020-06-05 Delimited Text or Plaintext MEDIN data format categories 2024-01-29 MEDIN data format categories World Register of Marine Species (WORMS) 2024-02-07 SeaDataNet Measurement Periodicity Categories 2024-01-29 SeaDataNet Measurement Periodicity Categories BODC-approved data storage units (Spatial Unit) 2023-10-12 BODC-approved data storage units (Spatial Unit) BODC-approved data storage units (Vertical Unit) 2023-10-12 BODC-approved data storage units (Vertical Unit) no limitations to public access Conditions for access and use apply ODC-By Oceans 2015-10-24 2015-12-14 6.3510554617731 15.667461711773 53.93363190413 57.88289773916 Delimited 1 Text or Plaintext 1 https://cloud.emodnet-ingestion.eu/index.php/s/0NAsdcv0mURA7wl WWW:DOWNLOAD-1.0-http--download www.emodnet-chemistry.eu WWW:LINK-1.0-http--link COMMISSION REGULATION (EC) No 1205/2008 of 3 December 2008 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards metadata 2010-12-08 See the referenced specification false Corrigendum to INSPIRE Metadata Regulation published in the Official Journal of the European Union, L 328, page 83 2010-12-08 See the referenced specification false Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 See the referenced specification false 10 sediment samples from the North Sea consisting of ~50 ml (~100 g wet weight (ww)) were first chemically digested by two hours of thoroughly shaking with 100 ml of a solution (consisting of ~3 % potassium hydroxide, ~1 % potassium tripolyphosphate, ~1 % potassium silicate and ~7 % sodium hypochlorite, so dominant fractions of natural organic matter were decomposed. Similar treatment of different types of common plastic materials showed no larger external changes in the particle structure. This was followed density, separation by adding 100 ml of saturated saline solution, followed by ten minutes of shaking and consequently five minutes of ultrasonic treatment. The particles in the samples were allowed to settle for five minutes after each of the two steps. Pooled supernatant was filtered into six size fractions, i.e. 20-38, 38-100, 100-300, 300-1000 and 1000-5000 µm, by being flushed with filtered freshwater through the sediment test sieves (Retsch) placed on top of each according to decreasing mesh size. For each size fraction, particles retained on the test sieves and regarded as of synthetic origin were visually identified as microplastic-like particles based on their relatively homogenous texture and structure using a stereo microscope (20-50x magnification). In size fraction 20-38 mm and 38 -100 µm only fibres longer than >100 µm were counted and these data are in the data sheet aggregated with data for the size fraction 100 – 300 µm. For quality assurance of the analyses, all glassware was cleaned and baked in the oven at 450 °C prior to the start of the microplastic analysis, and all the reagents were filtered using 20 µm mesh sizes. Additionally, the risk for airborne particulate contamination was controlled every day of sample analysis