Trifluoroacetic acid (TFA) belongs to the subclass of per-and polyfluoroalkyl substances (PFAS) known as ultra-short chain perfluoroalkyl acids (PFAAs). TFA is by far the most abundant PFAS in the environment . Neuwald et al. demonstrated that TFA accounted for more than 90% of the total PFAS mass (of 46 individual PFAS analyzed) in various drinking water sources in Germany 2 . Tian et al. observed that concentrations of TFA and perfluoropropionic acid (PFPrA) in air, dry-deposition particles and plant leaves surrounding two landfills in China were an order of magnitude higher than those of the 21 other PFAS analyzed . Chen et al. measured 25 PFAS around two fluorochemical manufacturing plants in China, covering 8 different media (air, various water, soil, dust, plant leaves, sediment), with TFA concentrations being consistently 1-2 orders of magnitude higher than those of other PFAS .