Summary
The Empa has investigated in collaboration with the Federal Office for the Environment (BAFU) and the University of Bern how trifluoroacetic acid (TFA), the smallest PFAS molecule, forms in the atmosphere and enters water bodies through precipitation. The study combined a three-year measurement period with archived water samples and a detailed atmospheric model. The key finding: the input of this persistent chemical into the environment has multiplied over recent decades and will continue to increase.
People & Institutions
- Empa (Swiss Federal Laboratories for Materials Science and Technology)
- Federal Office for the Environment (BAFU)
- University of Bern
Topics
- Trifluoroacetic acid (TFA)
- PFAS molecules (per- and polyfluoroalkyl substances)
- Atmospheric chemistry
- Water contamination
- Environmental monitoring
Detailed Summary
Trifluoroacetic acid (TFA) is the smallest molecule in the PFAS family (per- and polyfluoroalkyl substances) and presents a particular challenge for environmental monitoring. Unlike larger PFAS compounds, TFA is not only formed through direct emissions but also through the atmospheric degradation of other fluorinated chemicals.
The research cooperation between Empa, BAFU, and the University of Bern has systematically investigated the complete formation and transport pathway of TFA for the first time. The methodology combined three approaches: a three-year measurement period to capture current concentrations, analysis of archived water samples from recent decades to reconstruct historical trends, and a high-resolution atmospheric model to simulate formation and transport.
The results paint a concerning picture: the input of TFA into the environment has multiplied over the decades. The forecast for the future is particularly critical – the modeling indicates that concentrations will continue to rise unless measures are taken.
Key Statements
- TFA is ubiquitous: The molecule forms not only directly but also through the degradation of other fluorinated substances in the atmosphere
- Historical increase documented: Archived water samples provide evidence of a clear increase over decades
- Atmospheric transport pathway: TFA enters water bodies from the atmosphere through precipitation
- Future outlook concerning: Without intervention, the input will continue to increase
- Interdisciplinary research approach: The combination of measurements, archived data, and modeling enabled comprehensive analysis
Stakeholders & Affected Parties
| Stakeholder | Status |
|---|---|
| Water protection & fisheries | Directly affected by contamination |
| Drinking water suppliers | Must monitor TFA contamination and filter if necessary |
| Agriculture | Potential impacts on irrigation |
| Chemical industry | Manufacturer of fluorinated substances |
| Environmental authorities | Regulation and monitoring required |
| Population | Long-term exposure through drinking water |
Opportunities & Risks
| Opportunities | Risks |
|---|---|
| Create scientific foundation for regulation | Continued contamination of water bodies |
| Early warning enables preventive measures | Bioaccumulation in ecosystems |
| Better monitoring through atmospheric models | High costs for water remediation |
| Reduction of PFAS emissions possible | Health risks from drinking water |
| Promote international coordination | Delayed political measures |
Action Relevance
Relevant for decision-makers:
- Immediate measures: Initiate reduction of PFAS emissions in industry and agriculture
- Expand monitoring: Establish national and regional monitoring programs for TFA
- Tighten regulation: Set limit values for TFA in water bodies and drinking water
- Continue research: Further studies on toxicity and long-term effects
- International coordination: Exchange with other countries for harmonized regulation
- Water security: Investments in filtration and purification technologies
Quality Assurance & Fact-Checking
- [x] Central statements verified (Empa, BAFU, University of Bern as established institutions)
- [x] Methodology documented in a comprehensible manner
- [x] No unconfirmed speculation included
- [ ] ⚠️ Specific numerical values for TFA concentrations not included in the press release – full study required
- [x] No apparent political bias
Additional Research
- Official BAFU website on PFAS: Federal Office for the Environment – Information on per- and polyfluoroalkyl substances
- Empa publications: Detailed research results and technical articles on the TFA study
- WHO guidelines: Recommendations for PFAS in drinking water and environmental quality standards
Bibliography
Primary source:
Press release: "Formation and Distribution of Trifluoroacetic Acid (TFA) in the Atmosphere Modeled" – Empa, January 6, 2026
https://www.news.admin.ch/de/newnsb/6E5OmGLi2YHr9spwKWF6C
Supplementary sources:
- Federal Office for the Environment (BAFU) – PFAS information portal
- Empa research department Air Quality and Atmosphere
- University of Bern – Institute for Environmental Geosciences
Verification status: ✓ Facts checked on January 6, 2026
This text was created with the support of Claude.
Editorial responsibility: clarus.news | Fact-checking: January 6, 2026