Mapping PFAS behavior via meta-analysis of soil dynamics, predictive modeling and policy integration

Area of Science:

• Environmental Chemistry
• Soil Science
• Ecotoxicology

Background:

• Per- and polyfluoroalkyl substances (PFAS) are persistent organic pollutants increasingly found in agricultural soils.
• Sources include biosolid application, wastewater irrigation, and atmospheric deposition.
• Inconsistent terminology in research hinders regulatory harmonization and model calibration.

Purpose of the Study:

• To conduct a meta-analysis of PFAS terminologies across 145 studies.
• To review empirical data on PFAS leaching, analytical advancements, and modeling tools.
• To compare global regulatory frameworks and propose strategies for managing PFAS in agroecosystems.

Main Methods:

• Meta-analysis of 145 peer-reviewed studies on PFAS terminology.
• Review of empirical data on PFAS leaching depths and analytical detection limits.
• Assessment of modeling tools (HYDRUS, MODFLOW-MT3DMS, CalTOX) for PFAS transport.
• Comparative analysis of global policy approaches (US EPA, EU REACH, Austrian ÖNORM S 2088-2).
• Evaluation of remediation techniques like biochar application and plasma treatment.

Main Results:

• Identified significant inconsistencies in classifying PFAS subgroups (e.g., long-chain vs. short-chain, precursors).
• PFAS leaching depths vary from 3 cm (sandy soil, low irrigation) to 10 cm (clay, high irrigation).
• Advanced analytical techniques achieve detection limits <0.05 μg/kg; hyperspectral drones offer 1m resolution hotspot identification.
• Biochar reduced PFOS leaching by >80%; plasma treatment achieved 95% degradation in 2 hours.
• Global regulatory frameworks are fragmented, with differing approaches to monitoring and setting thresholds.

Conclusions:

• Standardization of PFAS terminology is essential for regulatory consistency and accurate modeling.
• Integrated, multi-model simulations and hybrid remediation strategies are needed for effective PFAS management.
• Policy convergence, data transparency, and international cooperation are vital for safeguarding soil health, food safety, and ecological resilience.