Microplastic Polymer Mass Fractions in Marine Bivalves: From Isolation to Hazard Risk.

Area of Science:

• Environmental Science
• Marine Biology
• Analytical Chemistry

Background:

• Microplastics (MPs) are pervasive marine pollutants with increasing concern for human health via seafood.
• Analyzing MPs in bivalves is complex due to diverse polymer characteristics and lack of standardized methods.

Purpose of the Study:

• To review efficient bivalve digestion methods for microplastic analysis, focusing on microwave-assisted procedures.
• To present recent advancements in pyrolysis gas chromatography-mass spectrometry (Pyr-GC-MS) for MP quantification.
• To overview MP abundance, types, and mass fractions in bivalves and assess human health risks.

Main Methods:

• Review of existing literature on bivalve digestion techniques for microplastic extraction.
• Examination of microwave-assisted (MAW) procedures for efficiency and time reduction.
• Analysis of data from pyrolysis gas chromatography-mass spectrometry (Pyr-GC-MS) for polymer profiling.

Main Results:

• Microwave-assisted procedures offer efficient and time-saving digestion of bivalve tissues.
• Nine polymer types were identified, with polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC) being most prevalent.
• MP concentrations ranged from 0.26 to 36.4 µg/g wet weight, indicating moderate to high human health risks from bivalve consumption.

Conclusions:

• Standardized methods are crucial for accurate microplastic assessment in marine organisms.
• Efficient analytical techniques like MAW and Pyr-GC-MS are vital for understanding MP contamination.
• Human consumption of contaminated bivalves presents a significant health concern due to microplastic ingestion.