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Microplastic concentrations from a tidal flat near Tokyo Bay, Japan collected on 2020-06-04 (NCEI Accession 0285699)

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This study estimated the concentration of microplastics (i.e. plastics measuring less than 5mm; reported in unit of pieces/m2) from a tidal flat near Tokyo Bay, Japan collected on 2020-06-04. Microplastics were collected using a metal scoop and sieved through a mesh size of 1000 μm. This dataset contains the detailed results from all 351 individual microplastic samples encountered including the shape, size and color, in a spreadsheet format.

Dataset Citation

Cite as: Tanoiri, Hiraku; Nakano, Haruka; Arakawa, Hisayuki; Hattori, Ricardo Shohei; Yokota, Masashi (2023). Microplastic concentrations from a tidal flat near Tokyo Bay, Japan collected on 2020-06-04 (NCEI Accession 0285699). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0285699. Accessed [date].

Dataset Identifiers

ISO 19115-2 Metadata

gov.noaa.nodc:0285699

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Download Data	HTTPS (download) Navigate directly to the URL for data access and direct download. FTP (download) These data are available through the File Transfer Protocol (FTP). FTP is no longer supported by most internet browsers. You may copy and paste the FTP link to the data into an FTP client (e.g., FileZilla or WinSCP).
Distribution Formats	Excel
Ordering Instructions	Contact NCEI for other distribution options and instructions.
Distributor	NOAA National Centers for Environmental Information +1-301-713-3277 NCEI.Info@noaa.gov
Dataset Point of Contact	NOAA National Centers for Environmental Information ncei.info@noaa.gov

Time Period	2020-06-04 to 2020-06-04
Spatial Bounding Box Coordinates	West: 139.67628 East: 139.67628 South: 35.49756 North: 35.49756
Spatial Coverage Map

General Documentation

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Descriptive Information
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Associated Resources

The NOAA NCEI Global Marine Microplastics Database (1972-present)
- NCEI Collection
  Navigate directly to the URL for data access and direct download.
Tanoiri, H., Nakano, H., Arakawa, H., Hattori, R. S., & Yokota, M. (2021). Inclusion of shape parameters increases the accuracy of 3D models for microplastics mass quantification. Marine Pollution Bulletin, 171, 112749. https://doi.org/10.1016/j.marpolbul.2021.112749
- https://doi.org/10.1016/j.marpolbul.2021.112749
  related journal article

gov.noaa.nodc:NCEI-Marine-Microplastics

Publication Dates	publication: 2023-12-02
Data Presentation Form	Digital table - digital representation of facts or figures systematically displayed, especially in columns
Dataset Progress Status	Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility
Data Update Frequency	As needed
Supplemental Information	Submission Package ID: ETL10F
Purpose	These microplastic concentration data were collected in order to determine their abundance in a tidal flat near Tokyo Bay, Japan during 2020-06-04
Use Limitations	accessLevel: Public Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.

Dataset Citation	Cite as: Tanoiri, Hiraku; Nakano, Haruka; Arakawa, Hisayuki; Hattori, Ricardo Shohei; Yokota, Masashi (2023). Microplastic concentrations from a tidal flat near Tokyo Bay, Japan collected on 2020-06-04 (NCEI Accession 0285699). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0285699. Accessed [date].
Cited Authors	Tanoiri, Hiraku Tokyo University of Marine Science and Technology Nakano, Haruka Tokyo University of Marine Science and Technology Arakawa, Hisayuki Tokyo University of Marine Science and Technology Hattori, Ricardo Shohei Tokyo University of Marine Science and Technology Yokota, Masashi Tokyo University of Marine Science and Technology
Contributors	Tokyo University of Marine Science and Technology (TUMSAT)
Resource Providers	Hiraku Tanoiri Tokyo University of Marine Science and Technology (TUMSAT) Tokyo University of Marine Science and Technology (TUMSAT)
Points of Contact	Ebenezer Nyadjro Mississippi State University; Northern Gulf Institute (NGI)
Publishers	NOAA National Centers for Environmental Information

Theme keywords	NODC DATA TYPES THESAURUS microplastic concentration NODC OBSERVATION TYPES THESAURUS in situ laboratory analyses WMO_CategoryCode oceanography Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > OCEANS > WATER QUALITY > SEA SURFACE CONTAMINANTS > MICROPLASTIC CONCENTRATION
Data Center keywords	NODC COLLECTING INSTITUTION NAMES THESAURUS Tokyo University of Marine Science and Technology NODC SUBMITTING INSTITUTION NAMES THESAURUS Tokyo University of Marine Science and Technology Global Change Master Directory (GCMD) Data Center Keywords TUMST > Tokyo University of Marine Science and Technology
Instrument keywords	NODC INSTRUMENT TYPES THESAURUS Fourier-transform infrared (FTIR) spectrometer microscope sediment sieve Global Change Master Directory (GCMD) Instrument Keywords FTIR SPECTROMETER > Fourier Transform Infrared Spectrometer GRANULOMETRIC SIEVES MICROSCOPES > MICROSCOPES Provider Instruments Metal scoop
Place keywords	NODC SEA AREA NAMES THESAURUS North Pacific Ocean Global Change Master Directory (GCMD) Location Keywords OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN Provider Place Names Pacific Ocean
Keywords	NCEI ACCESSION NUMBER 0285699

Use Constraints	Cite as: Tanoiri, Hiraku; Nakano, Haruka; Arakawa, Hisayuki; Hattori, Ricardo Shohei; Yokota, Masashi (2023). Microplastic concentrations from a tidal flat near Tokyo Bay, Japan collected on 2020-06-04 (NCEI Accession 0285699). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0285699. Accessed [date].
Access Constraints	Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
Fees	In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.

Lineage information for: dataset
Processing Steps	2023-12-02T21:43:30Z - NCEI Accession 0285699 v1.1 was published.
Output Datasets	NCEI Accession 0285699 v1.1 NCEI Accession 0285699 v1.1 (download) published 2023-12-02T21:43:30Z

Lineage information for: dataset
Processing Steps	Parameter or Variable: microplastic concentration (measured); Units: pieces/m2; Observation Category: in situ; Sampling Instrument: Metal scoop; Sampling and Analyzing Method: Samples were collected on June 4, 2020, at a tidal flat located at the mouth of Tsurumi River (35◦29′51.2′′ N, 139◦40′34.6′′ E, Tokyo Bay, Japan). This place was chosen because Tsurumi River passes through one of the most densely populated area in Japan (basin area: 235 km2, population density: about 9.2 × 103 people/km2), and, consequently, the concentration and diversity of microplastics are estimated to be high. A rectangular frame of 1.0 m parallel to the coastline and 0.5 m perpendicular to the coastline was set up at an arbitrary point in the tidal zone. All drifted materials inside the frame were collected and transferred to the laboratory. A total of 351 particles of “large microplastics” measuring 1 mm to 5 mm in length were randomly selected under a stereomicroscope and classified into five shapes (Fragment, Foam, Film, Fiber, and Pellet), based on the classification chart proposed by GESAMP (2019). Since a large number of shells were found at the sampling site, samples were initially treated with a 20% formic acid (HCOOH) solution for 10 min at room temperature for calcium carbonate removal. Then samples received a treatment with a solution of hydrogen peroxide (H2O2) and iron (II) sulfate heptahydrate (FeSO4 ⋅ 7H2O, 0.01 g per 10 mL of 30% H2O2, acidic condition of 0.5% HCOOH) for 3 days at room temperature, followed by another treatment with 20% potassium hydroxide solution (KOH) for 2 days at 50 ◦C. Finally, samples were rinsed with distilled water and dried at 50 ◦C for 1 day. Since previous studies on microplastic extraction methods have pointed out that the use of strong acids in chemical treatments and heating above 60 ◦C can cause loss or dissolution of microplastics, this study used formic acid, a weak acid, in order to minimize the impacts on microplastics. The effects of this acid were compared by microscope images and mass measured before and after the treatment. Images (light source: dark field illumination method, with SZX2-ILST LED illumination mount, Olympus, Japan, exposure time: 27.8 ms, ISO: 400, 5.44 × 103 dpi) were then captured using a binocular stereomicroscope (SZX10, Olympus, Japan) coupled with a camera (DP73, Olympus, Japan). Samples were also categorized into colors. The length of the samples was measured using ImageJ (version1.53a; Java1.8.0_112).; Data Quality Method: In order to prevent the contamination of plastic particles, all equipment and instruments for sample collection and processing were cleaned prior to use. Component analysis of the sample was performed using Attenuated Total Reflection method (ATR method) by Fourier transform infrared spectrometer (FT-IR, IRT-6600, Jasco Corporation, Japan). The infrared absorption spectra at wavenumber 400–4000 cm-1 was measured and compared with the spectra in the KnowItAll library (Bio-Rad Laboratories, U.S.A) to identify the polymer type. At this time, samples that were judged not to be plastic based on their composition were excluded..

Lineage information for: dataset

Processing Steps

Parameter or Variable: microplastic concentration (measured); Units: pieces/m2; Observation Category: in situ; Sampling Instrument: Metal scoop; Sampling and Analyzing Method: Samples were collected on June 4, 2020, at a tidal flat located at the mouth of Tsurumi River (35◦29′51.2′′ N, 139◦40′34.6′′ E, Tokyo Bay, Japan). This place was chosen because Tsurumi River passes through one of the most densely populated area in Japan (basin area: 235 km2, population density: about 9.2 × 103 people/km2), and, consequently, the concentration and diversity of microplastics are estimated to be high. A rectangular frame of 1.0 m parallel to the coastline and 0.5 m perpendicular to the coastline was set up at an arbitrary point in the tidal zone. All drifted materials inside the frame were collected and transferred to the laboratory. A total of 351 particles of “large microplastics” measuring 1 mm to 5 mm in length were randomly selected under a stereomicroscope and classified into five shapes (Fragment, Foam, Film, Fiber, and Pellet), based on the classification chart proposed by GESAMP (2019). Since a large number of shells were found at the sampling site, samples were initially treated with a 20% formic acid (HCOOH) solution for 10 min at room temperature for calcium carbonate removal. Then samples received a treatment with a solution of hydrogen peroxide (H2O2) and iron (II) sulfate heptahydrate (FeSO4 ⋅ 7H2O, 0.01 g per 10 mL of 30% H2O2, acidic condition of 0.5% HCOOH) for 3 days at room temperature, followed by another treatment with 20% potassium hydroxide solution (KOH) for 2 days at 50 ◦C. Finally, samples were rinsed with distilled water and dried at 50 ◦C for 1 day. Since previous studies on microplastic extraction methods have pointed out that the use of strong acids in chemical treatments and heating above 60 ◦C can cause loss or dissolution of microplastics, this study used formic acid, a weak acid, in order to minimize the impacts on microplastics. The effects of this acid were compared by microscope images and mass measured before and after the treatment. Images (light source: dark field illumination method, with SZX2-ILST LED illumination mount, Olympus, Japan, exposure time: 27.8 ms, ISO: 400, 5.44 × 103 dpi) were then captured using a binocular stereomicroscope (SZX10, Olympus, Japan) coupled with a camera (DP73, Olympus, Japan). Samples were also categorized into colors. The length of the samples was measured using ImageJ (version1.53a; Java1.8.0_112).; Data Quality Method: In order to prevent the contamination of plastic particles, all equipment and instruments for sample collection and processing were cleaned prior to use. Component analysis of the sample was performed using Attenuated Total Reflection method (ATR method) by Fourier transform infrared spectrometer (FT-IR, IRT-6600, Jasco Corporation, Japan). The infrared absorption spectra at wavenumber 400–4000 cm-1 was measured and compared with the spectra in the KnowItAll library (Bio-Rad Laboratories, U.S.A) to identify the polymer type. At this time, samples that were judged not to be plastic based on their composition were excluded..

Acquisition Information (collection)
Instrument	Fourier-transform infrared (FTIR) spectrometer microscope sediment sieve

Last Modified: 2024-07-11T14:03:55Z
For questions about the information on this page, please email: ncei.info@noaa.gov

Microplastic concentrations from a tidal flat near Tokyo Bay, Japan collected on 2020-06-04 (NCEI Accession 0285699)

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