Microplastics concentration in benthic sediments in primary fishing grounds around Ireland, northeast Atlantic Ocean, from 2020-06-07 to 2021-02-27 (NCEI Accession 0277497)
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title: Microplastics concentration in benthic sediments in primary fishing grounds around Ireland, northeast Atlantic Ocean, from 2020-06-07 to 2021-02-27 (NCEI Accession 0277497)
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abstract: This study was carried out to estimate the microplastics (i.e. plastics measuring less than 5mm, reported in unit of pieces per 100 g of d.w.) concentration in benthic sediments in primary fishing grounds in the northeast Atlantic Ocean. Microplastics data was collected from 2020-06-07 to 2021-02-27 using a Day grab. This dataset contains the results from all 17 sampling efforts, in a spreadsheet format.
purpose: These data were collected in order to determine the microplastic concentrations in benthic sediments in primary fishing grounds around Ireland, northeast Atlantic Ocean from 2020-06-07 to 2021-02-27
credit: Related Funding Agency: European Maritime and Fisheries Fund (EMFF) Marine Biodiversity Scheme (MB/2018/04)
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description: Parameter or Variable: microplastic concentration (measured); Units: pieces per 100 g of dry weight sediment; Observation Category: in situ; Sampling Instrument: Day grab; Sampling and Analyzing Method: Samples were collected from the six primary fishing grounds around Ireland, namely: Irish Sea West, Porcupine bank, Aran prawn ground, Southwest and Southeast coast, Labadie, Jones, and Cockburn, and Smalls. Sediment samples were collected between June 2020 and March 2021 from scientific surveys. All benthic sediment sampling occurred in waters at depths between 38 and 630 m. A Day Grab was deployed to collect benthic sediment samples for MP. All sediment samples were taken from the top 5 cm and placed into decontaminated glass jars with metal lids. The samples were frozen at −20 °C until processing. Sediment was removed from the freezer and washed using ultra-pure water into aluminum trays and dried in an oven at 40 °C for approximately seven days. The dry sediment was weighed and placed into decontaminated jars. MPs were extracted from the sediment matrix using a density separation method using Sodium Tungstate Dihydrate (Na2WO4·2H2O) solution (41% w/v; 1.4 g/cm3). Sodium tungstate solution was added to the sediment (3:1 ratio). The mixture was stirred for 5 min with a stainless-steel stirrer, covered with aluminum foil to prevent contamination, and left to settle for 24 h to allow for the settlement of the silt/clay component. Following the settling period, the supernatant containing floating MPs was pipetted off using a glass pipette and vacuum filtered using a vacuum pump (VCP 130) through a 47 mm Whatman® (GF/C) glass microfiber filter paper. Once the supernatant was filtered, the walls of the filtration device were rinsed using sodium tungstate dihydrate solution to avoid dilution of the solution, and to obtain any particles left on the walls of the funnel. The filter was then transferred onto a labelled petri dish for visual examination and sorting of MPs was performed under a stereo microscope connected to a camera with Olympus CellSens software. This procedure was repeated three times for each sediment sample.; Data Quality Method: Cross–contamination was reduced by using a 100% cotton lab coat and nitrile gloves at all times. Wearing of synthetic clothing under lab coat was avoided. Decontamination of glassware was carried out using dilute (10%) Nitric Acid (HNO₃), followed by rinsing three times using ultra-pure water and left to dry upside down to avoid -accumulation of airborne particles. All surfaces were cleaned prior to use. Air controls were used every day during all stages of processing. Procedural blanks were carried out on ultra-pure water, sodium tungstate and potassium hydroxide to monitor potential contamination..
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metadataMaintenance: (MD_MaintenanceInformation)
maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) asNeeded
maintenanceNote: Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.
contact: (CI_ResponsibleParty)
organisationName: NOAA National Centers for Environmental Information
role: (CI_RoleCode) custodian
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acquisitionInformation: (MI_AcquisitionInformation)
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: sediment sampler - grab
type: sediment sampler - grab
description: grab sampler is used to take a sample of surficial seafloor sediments
