Abundance of microplastics in beaches along the Thoothukudi coast, Gulf of Mannar region, India, during 2021-01-03 to 2021-06-08 (NCEI Accession 0282703)
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title: Abundance of microplastics in beaches along the Thoothukudi coast, Gulf of Mannar region, India, during 2021-01-03 to 2021-06-08 (NCEI Accession 0282703)
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abstract: This study estimated the concentration of microplastics (i.e. plastics measuring less than 5mm; reported in unit of items/kg d.w) in beach sediments along the Thoothukudi coast, Gulf of Mannar region, India, during 2021-01-03 to 2021-06-08. Microplastics in the sediments were collected using a shovel. This dataset contains the results from all 36 sediment samples, in a spreadsheet format.
purpose: These microplastic concentrations data were collected in order to determine their abundance in beach sediments along the Thoothukudi coast, Gulf of Mannar region, India, during 2021-01-03 to 2021-06-08
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title: Keerthika K, Padmavathy P, Rani V, Jeyashakila R, Aanand S, Kutty R. Contamination of microplastics, surface morphology and risk assessment in beaches along the Thoothukudi coast, Gulf of Mannar region. Environmental Science and Pollution Research. 2022 Jun 03; 29(50): 75525–75538.
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description: Parameter or Variable: microplastic concentration (measured); Units: items/kg dry weight sediment; Observation Category: in situ; Sampling Instrument: shovel; Sampling and Analyzing Method: This study was carried out to estimate the amount of microplastics in six sampling sites along the Thoothukudi Region, southeast India. Sediment samples were collected from the six sampling sites: Vembar (VE), Vellapatti (VP), Threspuram (TH), Spic Nagar (SN), Punnakayal (PN) and Thiruchendur (TC), during January 2021-June 2021. Sediments from the sampling sites were collected in from a foreshore area by placing a quadrant of 1 m2 size. A shovel was used for collecting the sediment samples of about 3 kg at a depth of 4 cm, and were taken in pre-cleaned glass bottles. The collected sediment and water samples were taken to the laboratory for extraction of microplastics. The sampled sediment was dried at 600Cin a hot air oven. After, it was with a 500-μm sieve to remove larger particles. The sieved samples were homogenized well and 30% H2O2 was added to digest the organic matter at room temperature (avg temp —31 °C) present in the sample. After digestion, the sediment samples were subjected to density separation. A saturated NaCl solution was used for the floatation of low-density polymers, and a saturated ZnCl2 solution was used for the floatation of low-and high-density polymers. The supernatant was filtered in the vacuum filtration unit with the Whatman filter paper 1. After the filtration of all the samples, the filter papers were sealed in the Petri dishes, labelled and dried in a hot air oven at 40 °C. The dried filter papers from all the samples were examined under a stereomicroscope with the eyepiece to measure and quantify MPs. MPs abundance were expressed as particles/kg. The polymer composition of the microplastics was investigated using attenuated total reflectance (ATR)–Fourier transform infrared spectroscopy (FTIR). A total of 700 particles representing fragments, fibers, irregular and foam particles (30% of the total particles) were examined in the ATR-FTIR system. The spectrum was obtained at a spectral range of about 4000–400 cm−1 with the addition of 32 scans and with the resolution of 4 cm−1. By comparing the resulting spectra with the reference spectra, the polymer identification was done.; Data Quality Method: Several measures were applied to minimize the potential microplastic contamination during the whole microplastic analysis procedures. To reduce background contamination of microplastics during the analysis, blank experiments were carried out with deionized water in the pre-cleaned beaker. They were then analyzed for the presence of airborne contamination during the investigation, and the results showed the absence of microplastics in the blank samples. To avoid cross contamination, lab coats and surgical gloves were worn during the analysis. The glassware and equipment were washed with distilled water at the start and end of the analysis..
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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: 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.
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: sediment sieve
type: sediment sieve
description: USA standard testing sieve (A.S.T.M.E.)
