Microplastics concentrations in subtidal sediments from the Sado River estuary and the Arrábida marine park, Portugal collected from 2018-08-22 to 2019-02-27 (NCEI Accession 0279326)

This study estimated the concentration of microplastics (i.e. plastics measuring less than 5mm; reported in unit of items/kg d.w) in subtidal sediments from the Sado River estuary and the Arrábida marine park, Portugal collected from 2018-08-22 to 2019-02-27. Microplastics were collected using a petite Ponar benthic grab. This dataset contains the results from all 36 sediment samples, in a spreadsheet format.