Microplastics abundance on sandy beaches of Chiapas, Mexico, during 2023-02-05 to 2023-02-12 (NCEI Accession 0290791)
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abstract: This study estimated the abundance of microplastics (i.e. plastics measuring less than 5mm, reported in units of MPs/kg d.w and MPs/m2) in five sampling sites on sandy beaches of Chiapas, Mexico, during 2023-02-05 to 2023-02-12. Beach sand were collected with a stainless-steel spatula for examination of microplastics. This dataset contains the results from all 25 samples, in a spreadsheet format.
purpose: These microplastic concentrations data were collected in order to determine their abundance on sandy beaches of Chiapas, Mexico, during 2023-02-05 to 2023-02-12.
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function: (CI_OnLineFunctionCode) download
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dataQualityInfo: (DQ_DataQuality)
scope: (DQ_Scope)
level: (MD_ScopeCode) dataset
lineage: (LI_Lineage)
processStep: (LE_ProcessStep)
description: NCEI Accession 0290791 v1.1 was published.
dateTime:
DateTime: 2024-04-23T21:15:21Z
output: (LE_Source)
sourceCitation: (CI_Citation)
title: NCEI Accession 0290791 v1.1
date: (CI_Date)
date: (inapplicable)
dateType: (CI_DateTypeCode) publication
citedResponsibleParty: (CI_ResponsibleParty)
individualName: (inapplicable)
contactInfo: (CI_Contact)
onlineResource: (CI_OnlineResource)
linkage: https://www.ncei.noaa.gov/archive/accession/0290791/1.1
protocol: HTTPS
name: NCEI Accession 0290791 v1.1
description: published 2024-04-23T21:15:21Z
function: (CI_OnLineFunctionCode) download
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dataQualityInfo: (DQ_DataQuality)
scope: (DQ_Scope)
level: (MD_ScopeCode) dataset
lineage: (LI_Lineage)
processStep: (LE_ProcessStep)
description: Parameter or Variable: microplastic concentration (measured); Units: MPs/kg d.w; Observation Category: in situ; Sampling Instrument: stainless-steel spatula; Sampling and Analyzing Method: This study was conducted in the Chiapas state in the southeast of Mexico, which borders to the east with Guatemala, to the south with the Pacific Ocean, and has about 260 km of coastline in the region known as Soconusco. Here, several touristic sandy beaches are located in rural areas, and are the most important tourist destinations, where the presence of microplastic (MPs) also can be related to the mouth of nearby rivers. It is worth noting that among the studied sites Puerto Chiapas Beach is an important cruise terminal and industrial zone, with high levels of cargo movement, offshore and cabotage, industrial fishing, and military activities throughout the year. The sand samples were collected in February 2023 during the dry season, and five beaches were studied in approximately 62 km of coast near the Mexico-Guatemala border region. In this work, a total of 25 sand samples were collected with an average weight of 3.5 kg each. Briefly, in the five studied beaches horizontal transects of 100 m was chosen on the high tide line where MPs tend to accumulate. The transects were divided into five equidistant points, and quadrants of 0.25 m2 (50 × 50 cm) were delimited. In each quadrant the top layer of sand (~1.0 cm thickness) was collected using a stainless-steel spatula and stored in a clean glass container. Once at the laboratory, samples were dried at 60 ◦C for 48 h and sieved using a 5 mm mesh sieve, the retained material (>5 mm) was discarded. MP particles were extracted from the sand samples by a flotation process using a saturated NaCl solution (density of 1.2 g/cm3). 1 kg of sieved sand (particles <5 mm) was transferred to a glass vessel, and 1 L of saturated NaCl solution was added, the mixture of the sand-salt solution was stirred for 5 min and left to rest for 1 h. Subsequently, the supernatant was passed through a 100 μm mesh sieve, and the filtered water was collected and returned to the glass with the sand sample, this extraction process was repeated three times. The particles retained on the sieve were washed with 500 mL of distilled water to remove excess of NaCl, and MP particles were transferred to Petri dishes using stainless steel tweezers and dried at 60 ◦C overnight. The collected MPs were counted and classified by shape (fiber, fragment, pellet, foam, and film) and color categories by using a magnifying glass (4x) and an optical microscope (VE-M1, VELAB).; Data Quality Method: To avoid the potential risk of contamination and erroneous results, the following quality control criteria were applied. All sand samples were collected using a stainless-steel spatula and stored in a clean glass container to protect them from external particle contamination. Moreover, distilled water and saturated NaCl solution was filtered using 0.4 μm pore diameter fiberglass (Whatman 969). Also, all glass vessels used in this work were previously rinsed with filtered distilled water and kept in a covered container to prevent cross contamination. All fiberglass filters, and sand samples were handled with nitrile gloves, and the MP particles were stored properly in sealed petri dishes. A Thermo Scientific Nicolet 6700 Fourier Transform Infrared (FTIR) spectroscopy was used for the identification of the most common MP particles found in the sand samples. MP particles with size between 1 – 5 mm were analyzed due to low area of the diamond crystal (0.75 mm2) in the FTIR equipment. The FTIR spectra were recorded in the range of 430 – 4000 cm-1, with a resolution of 4 cm-1 and 32 scans. Subsequently, the OMNIC software version 8.3 was used to identify its composition by comparison with the included FTIR spectral libraries such as Aldrich Sample Library, HR Nicolet Sampler Library, and Hummel Polymer Sample Library. In addition, the experimental FTIR spectra of polyethylene, polypropylene, and polystyrene were also compared with their respective theoretical IR spectra, since it was previously determined that these polymers were the most common in the sand samples. To calculate the IR spectra, we employed Gaussian code with the PBE0/Def2-TZVP level of theory and the D3 version of Grimme’s dispersion..
processStep: (LE_ProcessStep)
description: Parameter or Variable: microplastic concentration (measured); Units: MPs/m2; Observation Category: in situ; Sampling Instrument: stainless-steel spatula.
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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.)
