PFAS in Biota: Risk Context & Robust Analytical Solutions

Importance of the Topic

Biomonitoring using fish, shellfish and other organisms provides essential insight into persistent PFAS pollution across aquatic and terrestrial ecosystems.
These substances resist degradation, accumulate in tissues and magnify along food chains, posing ecological and human health risks.

Objectives and Study Overview

This study outlines the regulatory landscape for PFAS in biota within the EU and presents a validated analytical workflow for accurate detection in various matrices.
Key goals include assessing current and future legislation, identifying contamination pathways, and establishing precise quantitation methods for environmental monitoring.

Methodology and Instrumentation

An accredited LC–MS/MS procedure forms the core of the analytical strategy, supported by robust sample preparation and cleanup steps.

• Sample Preparation: Freeze-drying (lyophilization) and homogenization for representative test portions.
• Extraction: Modified QuEChERS protocol to recover PFAS from complex tissues.
• Cleanup: Solid phase extraction (SPE) to remove interferences prior to analysis.
• Detection: UHPLC–MS/MS with isotopically labeled internal standards for precise quantitation.

Instrumentation Used

• Ultra High Performance Liquid Chromatography–Tandem Mass Spectrometry (UHPLC–MS/MS).
• Lyophilizer for sample freeze-drying.
• Solid Phase Extraction (SPE) equipment.

Main Findings and Discussion

• EU limits currently set 9.1 µg/kg for PFOS in fish and 2.0 µg/kg for combined PFAS in food, with species-specific thresholds reflecting bioaccumulation differences.
• Proposed shift toward group-based regulation under the Water Framework Directive to address cumulative toxicity of PFAS as a class.
• Multiple contamination routes identified: industrial discharge, firefighting foams, soil and water uptake, atmospheric deposition and land-applied biosolids.
• Biomagnification in predatory fish and evidence of maternal transfer underscore long-term ecological impacts.

Practical Applications and Benefits of the Method

The validated LC–MS/MS workflow supports environmental compliance, food safety monitoring and ecological risk assessment.
Key advantages include high sensitivity (LOQs down to 0.1 µg/kg), broad analyte coverage across 40+ PFAS and robust correction for matrix effects.

Future Trends and Opportunities

• Implementation of group-based PFAS monitoring and regulation to manage combined environmental risks.
• Advances in non-targeted screening and high-resolution mass spectrometry for emerging PFAS identification.
• Automation and high-throughput sample processing to increase laboratory capacity and data reliability.
• Integration of biomonitoring data with ecological and human health risk models for comprehensive assessment.

Conclusion

This overview underscores the importance of rigorous analytical methods for detecting PFAS in biota to inform regulatory decisions and safeguard ecosystem and public health.
Continued method refinement and regulatory evolution are critical to address the pervasive challenge of PFAS contamination.

References

• Teunen et al. PFAS accumulation in indigenous and translocated aquatic organisms from Belgium, with translation to human and ecological health risk. Environmental Sciences Europe, 2021, 33:39.
• Byns et al. Bioaccumulation and trophic transfer of perfluorinated alkyl substances in marine biota from the Belgian North Sea: distribution and human health risk implications. Environmental Pollution, 2022, 311:119907.
• Gkika et al. Strong bioaccumulation of a wide variety of PFAS in a contaminated terrestrial and aquatic ecosystem. Environment International, 2025, 202:109629.