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Linking Vegetable Per- and Polyfluoroalkyl Substance Accumulation with Root Chemical Traits.

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Per- and polyfluoroalkyl substances (PFAS) accumulate differently in vegetables. Leafy greens show higher PFAS levels, particularly short-chain PFBA, while root vegetables retain more long-chain PFAS, offering dietary risk reduction strategies.

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Area of Science:

  • Environmental Chemistry
  • Plant Science
  • Toxicology

Background:

  • Per- and polyfluoroalkyl substances (PFAS) are persistent organic pollutants found in food crops.
  • Understanding PFAS accumulation in diverse plant species and influencing factors is crucial for food safety.
  • Farmland irrigation with treated wastewater presents a potential route for PFAS uptake by vegetables.

Purpose of the Study:

  • To investigate PFAS bioaccumulation patterns in 20 vegetable species.
  • To correlate PFAS accumulation with root chemical traits in vegetables grown in wastewater-irrigated soil.
  • To assess the impact of vegetable type and PFAS species on potential human exposure.

Main Methods:

  • Analyzed PFAS concentrations in 20 vegetable species grown in farmland irrigated with treated wastewater.
  • Quantified PFAS species, focusing on short-chain perfluorobutanoic acid (PFBA) and long-chain PFAS.
  • Examined the relationship between root chemical composition (alkyl carbon, O-alkyl carbon, dissolved organic carbon) and PFAS accumulation.

Main Results:

  • Leafy vegetables accumulated significantly higher PFAS concentrations (mean: 9.24 ng/g) than root vegetables.
  • Short-chain PFBA was the dominant PFAS species, accumulating in edible aerial parts of leafy vegetables.
  • Long-chain PFAS were primarily retained in the roots, with accumulation influenced by root dissolved organic carbon.

Conclusions:

  • Plant species and root chemistry significantly influence PFAS bioaccumulation and distribution.
  • Crop selection (choosing low-accumulation varieties) can reduce dietary PFAS exposure by up to 90%.
  • Rhizosphere management strategies can be employed to mitigate PFAS uptake in food crops.