ArticleNPJ emerging contaminants2026
Soil enzyme dynamics under PFAS contamination in arid and Mediterranean soils.
Article in NPJ emerging contaminants, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Per- and polyfluoroalkyl substances (PFAS) are persistent contaminants increasingly detected in agricultural soils, yet their effects on extracellular enzyme activities remain poorly resolved. This study examined the short- and long-term effects of perfluorooctanoic acid (PFOA) and 6:2 fluorotelomer sulfonic acid (6:2 FTSA) on the biochemical functioning of Mediterranean and arid agricultural soils. Soils were spiked with environmentally relevant concentrations (10, 50, and 250 ng g⁻¹ dry soil) and incubated for 210 days. The tested PFAS concentrations were selected to span literature-reported levels, ranging from typical to highly contaminated conditions. In the arid soil, both PFAS markedly impaired biochemical functioning, with Treated-Soil Quality Index values declining below 70% of control levels. In particular, 6:2 FTSA strongly inhibited β-glucosidase and alkaline phosphomonoesterase activities (up to 81.7%). The Mediterranean soil showed little enzymatic response to PFAS exposure. Eco-enzymatic stoichiometric modeling revealed PFAS-induced shifts in microbial enzyme allocation, particularly in the arid soil after prolonged exposure. PFOA remained stable throughout incubation, whereas 6:2 FTSA dissipated with the formation of perfluoroheptanoic acid. Overall, the arid soil was more biochemically sensitive to both PFAS compounds, suggesting that repeated applications of PFAS-contaminated biosolids or composts pose a greater biochemical risk in dryland agricultural systems.
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