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Updated: Dec 12, 2025
Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris
Published on: July 28, 2018
Comparison of microplastic isolation and extraction procedures from marine sediments
Michaela A Cashman1, Kay T Ho2, Thomas B Boving3
1U.S. Environmental Protection Agency, ORD/CEMM Atlantic Coastal Environmental Sciences Division, 27 Tarzwell Drive, Narragansett, RI 02882, USA; University of Rhode Island, Department of Geosciences, 9 E Alumni Avenue, Kingston, RI 02881, USA.
This study compared microplastic (MP) extraction methods from marine sediments. Recovery rates varied significantly based on sediment type, MP properties, and the extraction technique used, highlighting the need for standardized procedures.
Area of Science:
- Environmental Science
- Marine Biology
- Analytical Chemistry
Background:
- Microplastics (MPs) are pervasive pollutants in marine ecosystems, posing significant ecological risks.
- Accurate identification and quantification of MPs are essential for assessing their environmental impact and fate.
- Existing extraction methods lack standardization, hindering cross-study comparisons and data reliability.
Purpose of the Study:
- To evaluate and compare the efficiency of five different methods for extracting microplastics (MPs) from marine sediments.
- To determine the influence of sediment characteristics and MP properties on extraction recovery rates.
- To provide insights for optimizing MP extraction protocols and promoting methodological standardization.
Main Methods:
- Five distinct microplastic extraction techniques were applied to marine sediment samples.
- Known quantities of microplastics (40-710 micrometers) were artificially introduced (spiked) into sediment samples.
- Microplastics were extracted and enumerated to calculate the percentage recovery for each method and condition.
Main Results:
- Microplastic recovery rates varied widely, ranging from 0% to 87.4%, depending on the extraction method, sediment type, and microplastic characteristics.
- Larger particle size and lower density microplastics generally exhibited higher recovery rates.
- Sediments with lower organic matter content and larger grain sizes facilitated more effective microplastic recovery.
Conclusions:
- The efficiency of microplastic extraction from marine sediments is significantly influenced by the interplay between sediment matrix properties, microplastic attributes, and the chosen extraction methodology.
- Current extraction methods demonstrate substantial variability, underscoring the critical need for method optimization.
- The development and adoption of unified, standardized procedures are crucial for reliable and comparable microplastic research across different studies and datasets.
