The Microplastic-PFAS Nexus: From Co-Occurrence to Combined Toxicity in Aquatic Environments

Area of Science:

• Environmental Science
• Toxicology
• Chemistry

Background:

• Microplastic (MP) and per- and polyfluoroalkyl substance (PFAS) contamination are significant global environmental issues.
• These pollutants have been historically studied in isolation, but emerging evidence highlights their interconnectedness.

Purpose of the Study:

• To synthesize current knowledge on the MP-PFAS Nexus, detailing interaction mechanisms.
• To review the environmental fate, synergistic toxicity, and human health implications of MP-PFAS co-exposure.
• To assess the challenges and opportunities for remediation and policy development.

Main Methods:

• Literature review synthesizing existing research on MP-PFAS interactions.
• Analysis of mechanisms including adsorption, transport, and environmental aging.
• Consolidation of evidence on toxicological impacts and remediation strategies.

Main Results:

• MPs act as vectors, concentrators, and secondary sources for PFAS, with environmental factors modulating their fate.
• Co-exposure to MPs and PFAS often results in synergistic toxicity, affecting various organisms and physiological processes.
• The MP-PFAS nexus poses challenges for water treatment and soil remediation but offers opportunities for technologies like pyrolysis.

Conclusions:

• Current regulatory frameworks are inadequate as they assess pollutants individually, failing to account for combined effects.
• There is an urgent need to reframe MPs and PFAS as an interconnected pollutant system.
• Integrated research and policy are essential for effective environmental risk assessment and management of the MP-PFAS nexus.