Microplastics concentration collected from MRV Scotia, MRV Alba na Mara, and RV Sir John Murray in sea surface waters around Scotland from 2014-01-06 to 2020-01-18 (NCEI Accession 0259692)
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title: Microplastics concentration collected from MRV Scotia, MRV Alba na Mara, and RV Sir John Murray in sea surface waters around Scotland from 2014-01-06 to 2020-01-18 (NCEI Accession 0259692)
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abstract: This study estimated the load of surface microplastics in the surface waters around Scotland from 2014-01-06 to 2020-01-18. Microplastics data were collected using neuston net aboard MRV Scotia, MRV Alba na Mara and RV Sir John Murray. This dataset contains the results from all 398 surface net tows, in a spreadsheet format.
purpose: These data were collected in order to determine the microplastics concentrations in sea surface waters around Scotland.
credit: Related Funding Agency: Marine Scotland Science, fund # ROAME ST014
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beginPosition: 2014-01-06
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description: Parameter or Variable: MICROPLASTIC CONCENTRATION (measured); Units: pieces/m3; Observation Category: in situ; Sampling Instrument: Neuston net; Sampling and Analyzing Method: Sea surface water samples were collected with a 335 µm neuston net mounted on a catamaran swimmer body from January 2014 up to and including January 2020 using Marine Scotland Sciences’ research vessels MRVs Scotia and Alba na Mara and the Scottish Environment Protection Agency vessel the RV Sir John Murray. The catamaran was towed clear of the ships wake with the net sampling the upper 10 cm of the sea surface. Towing times varied from 9 minutes to over 1 hour, depending on the available time and/or sea surface conditions. The average speed of the ship during towing was 5 knots (2.6 ms-1). Once towing was completed the net was rinsed into the cod end and the material in the cod end transferred to a sieve stack consisting of 5 mm and 125 µm aperture sieves and a base pan. The material was rinsed through the 5 mm sieve using fresh water. The material collected in the 125 µm sieve was examined and the microplastic particles collected and counted. Particular care was taken to check for microplastics adhering to larger material such as seaweed. The examination and picking of microplastics was carried out by two people, using a lighted magnifier, as a cross check that everything identified as plastic was collected. Analysts carrying out the procedure wore cotton coveralls or lab coats. To check for contamination during sample processing a blank glass slide covered in double sided sticky tape was positioned in the sample processing area. At the end of each counting session the slide was examined and the number of particles greater than approximately 300 μm were counted. Any particles <300 μm were discounted due to the limitation imposed by the net mesh which was 335 μm. In practice, no blank subtraction was required as no particles >300 μm were recovered from the slides.; Data Quality Method: Post survey, a selection of microparticles were analyzed by microscopy Fourier Transform Infrared Spectroscopy (microFTIR) to confirm that they were microplastics. Approximately 5% of the particles were selected for FTIR, the selection being proportional to the count of particles in the categories detailed above, except for polystyrene and film..
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code: Neuston net
type: Neuston net
description: Neuston net is a net designed to sample plankton or microplastics located in the first few centimeters of the water column. cf. net - plankton net (insttypes_id 31)
