Estimations of floating microplastics and mesoplastics in the Ligurian and Tyrrhenian Seas collected from 2018-05-20 to 2018-06-15 (NCEI Accession 0279322)
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title: Estimations of floating microplastics and mesoplastics in the Ligurian and Tyrrhenian Seas collected from 2018-05-20 to 2018-06-15 (NCEI Accession 0279322)
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abstract: This study estimated the concentration of floating 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 2018-05-20 to 2018-06-15. Microplastics in the surface water were collected using a manta net. This dataset contains the results from all 34 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 2018-05-20 to 2018-06-15.
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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 using a manta trawl (330 μm mesh; 16 × 61 cm frame opening) that was towed on the water surface for 30–60 min at 1.5–3 knots on either starboard or port side. A spinnaker pole was used to position the trawl outside the wake of the vessel and to avoid loss of samples due to downwelling of debris. The outer side of the net was rinsed with fresh water to ensure that the entire sample was washed into the collecting bag fixed at the end of the net. This sample was emptied over a metal sieve with a mesh size of 300 μm. Plastic particles which could be visually detected in the metal sieve were collected using laboratory tweezers. In addition, saltwater, filtered through a sieve with a mesh size of 0.1 mm, was added into sample containers, which separated the plastic particles from the preserved natural material according to their density. Floating plastic particles at the surface were removed for further studies. Sorting of the material was conducted using a dissecting stereo microscope (Leica) and laboratory tweezers to hand pick the plastics, which were then transferred to 50 ml Falcon tubes. All samples were double checked by two crew members to ensure detection of all the particles.; 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. Attenuated total reflection Fourier transform infrared spectroscopy ATR FT-IR) was utilized to identify the composition of 140 representative particles (78 fragments, 24 films, 17 lines, 11 pellets, 10 foams). A Perkin Elmer Spectrum 65 FT-IR Spectrometer equipped with a Perkin Elmer universal attenuated total reflection (UATR) accessory and pressure arm was used to collect a combination of 10 spectra from 4000 cm−1 to 650 cm−1 for each particle. The resulting spectra were analyzed with the accompanying Perkin Elmer software and compared to the pristine polymer FT-IR spectra found in the Fluka library..
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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.