In situ occurrence and mobility of per and polyfluoroalkyl substances in soils amended with organic waste products

Michaud Aurélia Marcelline, Saliu Toyin Dunsin, Munoz Gabriel, Feder Frédéric, Sappin-Didier Valérie, Watteau Françoise, Houot Sabine, Sauvé Sébastien. 2025. In situ occurrence and mobility of per and polyfluoroalkyl substances in soils amended with organic waste products. Science of the Total Environment, 984:179708, 15 p.

Résumé : We evaluated the in situ occurrence and soil-water distribution of 75 anionic, zwitterionic, and cationic per- and polyfluoroalkyl substances (PFAS) in soils from five field experimental sites distributed in different climatic regions in France. Four sites received agronomical doses of organic waste products (OWPs, ∼5–10 t/ha per application) with repeated inputs between 1974 and 1996 (2 historical sites) and 1998–2018 (2 on-going sites), while one site received about two-fold larger amounts. Control soils without OWP application had detectable yet low PFAS levels, the Σ75PFAS remaining in most cases below 1 μg/kg. Soils amended with municipal sludge or urban composts exhibited the largest Σ75PFAS increase relative to controls (∼2–20 μg/kg), with soils receiving biowaste composts displaying the lowest Σ75PFAS (∼2 μg/kg). In most cases, Σ75PFAS increased significantly with time. While perfluorooctane sulfonate (PFOS) typically dominated the PFAS profiles in municipal sludge-amended soils, the other prevalent PFAS classes varied with sites and years: soils from older sites also had anionic and cationic electrochemical fluorination-derived precursors (e.g., EtFOSAA and PFOSAmS), while on-going sites had increased prevalence of short-chain perfluoroalkyl carboxylates (PFCAs) (3 sites) and perfluoroalkyl phosphinates (1 site). Interestingly, 6:2 fluorotelomer sulfonamidopropyl betaine (6:2 FTAB), a major zwitterionic precursor found in French municipal sludge, was only detected at low levels in soils, indicating its transformation to degradation products. Leaching waters at a depth of 45 cm in the experimental plots had high levels of short-chain PFCAs (Mean C3-C5: 120–160 ng/L; Max C3-C5: 900–1600 ng/L), suggesting that land applied OWP containing PFCA precursors are important contributors to long-term groundwater contamination.

Mots-clés Agrovoc : déchet organique, fumier, fertilisation, compost, technique analytique, amendement du sol, expérimentation au champ, comportement animal, amendement organique, fertilité du sol

Mots-clés géographiques Agrovoc : France, La Réunion

Mots-clés libres : PFAS, Compost, Sewage sludge, Long-term field experiment

Agences de financement hors UE : Strategic Environmental Research and Development Program

Auteurs et affiliations

• Michaud Aurélia Marcelline, INRAE (FRA)
• Saliu Toyin Dunsin, Université de Montréal (CAN)
• Munoz Gabriel, Université de Montréal (CAN)
• Feder Frédéric, CIRAD-PERSYST-UPR Recyclage et risque (FRA) ORCID: 0000-0001-8434-5193
• Sappin-Didier Valérie, INRAE (FRA)
• Watteau Françoise, INRAE (FRA)
• Houot Sabine, INRAE (FRA)
• Sauvé Sébastien, Université de Montréal (CAN) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/614660/)

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