What the study found
PFAS aerosols formed mainly as fine particles, with most compounds showing a peak at 0.3 µm. The study also found that behavior differed by compound type: sulfonated PFAS were broadly similar across chain lengths, while PFCA increased in aerosolisation with chain length.
Why the authors say this matters
The authors conclude that PFAS aerosol behavior in mixed-solvent systems is controlled primarily by physical droplet generation and evaporation. They say this has implications for airborne transport and inhalation exposure from contaminated aqueous sources.
What the researchers tested
The researchers studied aerosolisation and size-resolved behavior of 25 PFAS, including short-, medium-, and long-chain perfluoroalkyl carboxylic acids (PFCA), perfluoroalkane sulfonates, fluorotelomer sulfonates, and emerging alternatives. They ran controlled chamber experiments in a water–organic solvent system, with and without the model bacterium Pseudomonas fluorescens seed, and then used Multiple-Path Particle Dosimetry (MPPD) modeling based on the measured size distributions.
What worked and what didn't
Most PFAS showed unimodal mass–size distributions peaking at 0.3 µm, indicating dominant association with the fine mode. PFOS showed additional ultrafine enrichment, while 6:2 FTS and NaDONA showed broader size profiles; in contrast, the bacterial seed did not increase PFAS aerosol concentrations, shift modal diameters, or produce enrichment at the bacterial size mode.
What to keep in mind
The abstract describes controlled chamber conditions, so the findings are limited to the tested mixed-solvent system and materials. It does not describe broader real-world atmospheric conditions beyond the authors' stated implication for airborne transport and inhalation exposure.
Key points
- Most PFAS aerosols peaked at 0.3 µm, indicating fine-particle dominance.
- Sulfonated PFAS behaved similarly across chain lengths, while PFCA aerosolisation increased with chain length.
- PFOS showed ultrafine enrichment; 6:2 FTS and NaDONA had broader size profiles.
- Pseudomonas fluorescens seed did not increase PFAS aerosol concentrations or change modal diameters.
- MPPD modeling predicted substantial pulmonary deposition, especially for ultrafine-enriched compounds.
Disclosure
- Research title:
- PFAS aerosols concentrated in fine particles under chamber conditions
- Authors:
- Ivan Kourtchev, Steve Coupe, Alison Buckley, Jishnu Pandamkulangara Kizhakkethil, Elena Gatta, Dario Massabò, P. Prati, Virginia Vernocchi, Federico Mazzei
- Institutions:
- Coventry University, Environment Agency, University of Genoa, Istituto Nazionale di Fisica Nucleare, Sezione di Genova
- Publication date:
- 2026-03-03
- OpenAlex record:
- View
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