When every particle matters: A QuEChERS approach to extract microplastics from environmental samples.

Area of Science:

• Environmental Science
• Analytical Chemistry
• Polymer Science

Background:

• Accurate microplastic (MP) identification, especially for small particles (<500 μm), necessitates minimizing natural particle interference while preserving synthetic polymer integrity.
• Extracting MPs from complex matrices like sediments, sludge, and soils demands robust and efficient methodologies due to the diverse physical and chemical properties of both natural and synthetic particles.

Purpose of the Study:

• To present a universal framework of modular protocols for microplastic extraction, adaptable to user requirements and laboratory conditions.
• To introduce innovative procedures and technical advancements for enhanced MP recovery from particle-rich environmental matrices.
• To promote the standardization of microplastic quantification methods through the dissemination of best-practice protocols.

Main Methods:

• Development of a universal framework of modular protocols, presented as a decision tree, adhering to QuEChERS (Quick, Easy, Cheap, Effective, Rugged, Safe) principles.
• Implementation of new procedures and technical innovations for density separation, including a novel spiral conveyor specifically designed and validated for microplastic recovery.
• Establishment of best practices for microplastic working conditions within a standard laboratory setting.

Main Results:

• Successful publication of protocols covering an entire microplastic extraction pipeline (10 μm - 5 mm) for particle-based analysis across various environmental matrices.
• Demonstration of modularity, allowing optimized quantitative sample preparation tailored to specific particle sizes and sample matrices.
• Validation of new protocols and technical innovations, such as the spiral conveyor, leading to optimized microplastic extraction efficiency.

Conclusions:

• The presented modular protocol framework offers a standardized approach to microplastic extraction, enhancing comparability across studies.
• The innovative techniques, including the spiral conveyor, significantly improve the efficiency and accuracy of microplastic recovery from challenging environmental samples.
• Adoption of these best-practice protocols is crucial for advancing the field of microplastic research and enabling reliable quantification.