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Area of Science:

  • Environmental Chemistry
  • Toxicology
  • Chemical Engineering

Background:

  • Hexafluoropropylene oxide dimer acid (HFPO-DA), known as GenX, is increasingly used as a substitute for perfluorooctanoic acid (PFOA).
  • HFPO-DA applications have expanded into semiconductor manufacturing, alongside traditional uses.
  • Concerns exist regarding HFPO-DA's low biodegradation rate and long-range atmospheric transport potential.

Purpose of the Study:

  • To review the environmental interactions, toxicities, and potential carcinogenicity of HFPO-DA.
  • To summarize current exposure assessment and risk management strategies for HFPO-DA.
  • To evaluate the ongoing safety concerns of HFPO-DA as a PFOA alternative.

Main Methods:

  • Literature review based on the US EPA's 2021 evaluation of HFPO-DA.
  • Synthesis of data on HFPO-DA's environmental fate and transport.
  • Compilation of toxicological studies and mechanistic insights.

Main Results:

  • HFPO-DA is ubiquitously detected in environmental media and biological species.
  • Evidence suggests potential toxicities and carcinogenicity, with ongoing research into mechanisms.
  • Current risk management strategies and exposure assessments are under review.

Conclusions:

  • Despite being considered less persistent and toxic than PFOA, HFPO-DA's safety profile warrants further investigation.
  • Continued monitoring and research are essential for comprehensive risk assessment.
  • The expanding use of HFPO-DA necessitates a thorough understanding of its long-term environmental and health impacts.