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Related Experiment Video

Updated: Nov 26, 2025

Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris

Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris

Published on: July 28, 2018

Method for microplastics extraction from Lake sediments.

M Zobkov¹, M Zobkova¹, N Galakhina¹

¹Northern Water Problems Institute of Karelian Research Centre of the Russian Academy of Sciences 50, Alexander Nevsky prospekt, Petrozavodsk 185030, Republic of Karelia, Russia.

|December 9, 2020

Summary

This summary is machine-generated.

This study presents an effective method for quantifying microplastics (MPs) in freshwater sediments. The approach utilizes peroxide oxidation and potassium formate density separation, achieving high extraction efficiency for diverse MP types.

Keywords:

Microplastics;Freshwater;Sediments;Identification;Potassium formate

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Last Updated: Nov 26, 2025

Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris

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Area of Science:

Environmental Science
Analytical Chemistry
Ecotoxicology

Background:

Microplastic (MP) contamination is a significant global ecological issue.
Bottom sediments act as major sinks for MPs, with river-lake systems serving as key transport routes to marine environments.
Accurate determination of MPs in freshwater sediments is crucial for understanding sedimentation and identifying contamination sources.

Purpose of the Study:

To develop and validate a method for determining microplastic abundance in organic-rich freshwater sediments.
To optimize the extraction process for various microplastic types and sizes.
To assess the efficiency of the proposed microplastic determination technique.

Main Methods:

Organic matter digestion using repeated wet peroxide oxidation.
Density separation of microplastics using potassium formate solution (density 1.5 g/mL).
Identification of microplastic particles (fibers, films, fragments, beads) ranging from 0.174 to 5 mm.

Main Results:

The developed method demonstrated high effectiveness in extracting microplastics from freshwater sediments.
Potassium formate density separation achieved an extraction efficiency of 98.0 ± 2%.
Microscopic analysis confirmed an MP extraction rate of 92.0 ± 4%.

Conclusions:

The proposed method provides a reliable and efficient means for quantifying microplastics in organic-rich freshwater sediments.
This technique is suitable for identifying diverse microplastic morphologies and sizes.
The findings contribute to better monitoring and management of microplastic pollution in aquatic ecosystems.