Concentrations of buoyant microplastics and mesoplastics in the Ligurian and Tyrrhenian Seas collected from 2019-06-04 to 2019-06-14 (NCEI Accession 0279323)
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title: Concentrations of buoyant microplastics and mesoplastics in the Ligurian and Tyrrhenian Seas collected from 2019-06-04 to 2019-06-14 (NCEI Accession 0279323)
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abstract: This study estimated the concentration of buoyant microplastics (i.e. plastics measuring less than 5mm; reported in unit of pieces/km2) and mesoplastics (i.e. plastics measuring 5mm – 20cm; reported in unit of pieces/km2) in the Ligurian and Tyrrhenian Seas collected from 2019-06-04 to 2019-06-14. Microplastics in the surface water were collected using a manta net. This dataset contains the results from all 20 surface water samples, in a spreadsheet format.
purpose: These microplastic and mesoplastic concentration data were collected in order to determine their abundance in the surface waters of the Ligurian and Tyrrhenian Seas during 2019-06-04 to 2019-06-14.
credit: Related Funding Agency: Swiss National Science Foundation (# 190287)
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description: Parameter or Variable: microplastic concentration (measured); Units: pieces/km2; Observation Category: in situ; Sampling Instrument: Manta net; Sampling and Analyzing Method: Surface samples were collected in the Ligurian and Tyrrhenian Sea in 30-minute intervals using a manta trawl (330 μm mesh; 16 × 61 cm frame opening). The trawl was towed at an average speed of 2 knots on either starboard or port side; with the side used for collection being altered to ensure collection always occurred upwind from the vessel. To position the trawl, a spinnaker pole was used. The spinnaker pole put the trawl 2 m away from the vessel, thus ensuring it was outside of the wake and that loss of samples due to downwelling of debris was avoided. The outer side of the trawl's collection net was rinsed with fresh water to ensure that plastic particles sticking to the sides of the net were washed into the final collection bag. Once the entire sample was washed into the collection bag, it was emptied over a 300 μm mesh size metal sieve. Plastic particles that were larger than 300 μm were collected from the sieve using metal tweezers. After the initial sieving, filtered (metal sieve; 100 μm mesh) saltwater was added into sample containers in order to density separate smaller plastic particles from the other organic matter collected. Plastic particles found floating on the surface of the filtered saltwater were collected with metal tweezers. Additional sorting of particles whose material composition was still uncertain after the density separation was conducted using a dissecting stereo microscope (Leica) and laboratory tweezers. At least two crew members checked each sample to increase the likelihood that all plastic particles were detected. All plastic particles were then transferred to 50 mL Falcon tubes and transported to a laboratory for further analysis. The final sorted samples in their respective falcon tubes were dried under vacuum 24 h at 65 °C in a Binder vacuum oven prior to their final storage for future studies. Once the particles were completely dry, the mass of each sample was obtained using an AG204 Delta Range balance (readability and repeatability 0.1 mg (Mettler-Toledo, 2004)). Dried particles were then placed on a grid composed of 5 mm by 5 mm squares; thus allowing for the further differentiation of particles which belonged to the meso- and micro-size categories; and photographed with a Canon EOS 70D.; Data Quality Method: To prevent contamination, samples remained in sealed containers until their handling was necessary and cotton lab coats and latex gloves were worn during the handling. Analysis of the chemical fingerprints from representative particles were conducted. Briefly, a Perkin Elmer Spectrum 65 FTIR Spectrometer equipped with a Perkin Elmer universal attenuated total reflection (UATR) accessory and pressure arm was used to obtain the chemical fingerprints of the total 561 representative particles. A combination of 10 spectra ranging from 4000 cm−1 to 650 cm−1 were collected and averaged for each particle, analyzed with the accompanying Perkin Elmer Spectrum 10 software, and compared to the pristine polymer spectra in the Fluka library. Best matches (typically>70% similarity) provided by the library are reported..
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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: Fourier-transform infrared (FTIR) spectrometer
type: Fourier-transform infrared (FTIR) spectrometer
description: An FTIR spectrometer simultaneously collects high-resolution spectral data over a wide spectral range. This confers a significant advantage over a dispersive spectrometer, which measures intensity over a narrow range of wavelengths at a time.
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: Manta net
type: Manta net
description: Manta net is a small, easily manageable net designed to sample plankton or microplastics located in the first few centimeters of the water column.
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: microscope
type: microscope
description: instrument is used in lab analyses A microscope is an instrument used to see objects that are too small for the naked eye.
