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Updated: Feb 9, 2026

Sampling and Identification of Microplastics in Groundwater

Sampling and Identification of Microplastics in Groundwater

Published on: November 7, 2025

Microplastics on the Portuguese coast.

J Antunes¹, J Frias², P Sobral¹

¹MARE - Marine and Environmental Sciences Centre, Department of Science and Environmental Engineering, FCT, Universidade NOVA de Lisboa, Caparica, 2829-516 Caparica, Portugal.

Marine Pollution Bulletin

|June 12, 2018

Summary

This summary is machine-generated.

Marine plastic pollution is dominated by microplastics (MP), with higher concentrations found near industrial and port areas. These microplastics, primarily resin pellets, likely originate from land-based sources, necessitating collaborative prevention strategies.

Keywords:

Beach accumulation MSFD Marine anthropogenic litter Plastic pollution

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Area of Science:

Marine Biology
Environmental Science
Oceanography

Background:

Marine anthropogenic litter poses a significant environmental threat.
Microplastics (MP) are a prevalent component of marine pollution.
Understanding the sources and distribution of MP is crucial for effective management.

Purpose of the Study:

To analyze the composition and distribution of marine anthropogenic litter on Portuguese beaches.
To identify the primary sources and types of microplastics polluting coastal environments.
To inform strategies for mitigating marine plastic pollution.

Main Methods:

Collection and analysis of marine litter from eleven Portuguese beaches over a two-year period (2011-2013).
Quantification and categorization of collected items, with a focus on microplastics (1-5 mm diameter).
Correlation of microplastic concentrations with geographical location (industrial/port proximity) and environmental factors (wind exposure).

Main Results:

Plastic items constituted 99% of all collected litter, with microplastics accounting for 68%.
Higher microplastic concentrations were observed during winter/autumn, near industrial/port facilities, and on beaches exposed to dominant winds.
Resin pellets (79%) dominated near industrial zones, while fragments and polymeric foams were prevalent near fishing ports. Pellet sizes of 4 and 5 mm were most common.

Conclusions:

Microplastics found on Portuguese beaches predominantly originate from land-based sources, likely through deliberate discarding or accidental loss.
Effective prevention of marine anthropogenic litter requires a multi-stakeholder approach involving industry, fishing sectors, and the adoption of best practices.
Integrated management strategies are essential to reduce the input of microplastics into marine ecosystems.