Table 4. Summary of Literature Hydrated Electron (eaq–) Bimolecular Rate Constants for Per- And Polyfluoroalkyl Substances (PFAS).
| compd | acronym (chain length) | biomolecular rate constant, k (M-1s-1) | method | ref |
|---|---|---|---|---|
| trifluoroacetic acid | TFA (2C) | 1.9 × 106 | LFPa,b | (152) |
| 5.0 × 108 | LFPa | (132) | ||
| perfluoropropanoic acid | PFPrA (3C) | 5.8 × 108 | LFPa | (132) |
| perfluorobutanoic acid | PFBA (4C) | 7.1 × 106 | LFPa,b | (152) |
| 5.4 × 108 | LFPa | (132) | ||
| perfluoropentanoic acid | PFPA (5C) | 5.2 × 108 | LFPa | (132) |
| perfluorohexanoic acid | PFHxA (6C) | 5.4 × 108 | LFPa | (132) |
| perfluoroheptanoic acid | PFHpA (7C) | 7.5 × 108 | LFPa | (132) |
| perfluoroocatanoic acid | PFOA (8C) | 1.7 × 107 | LFPa | (152) |
| 5.1 × 107 | PRc | (153) | ||
| 7.1 × 108 | LFPa | (132) | ||
| perfluorononanoic acid | PFNA (9C) | 6.4 × 108 | LFPa | (132) |
| perfluorobutanesulfonate | PFBS (4C) | 1.8 × 109 | LFPa | (132) |
| perfluorohexanesulfonate | PFHxS (6C) | 1.7 × 109 | LFPa | (132) |
| perfluorooctanesulfonate | PFOS (8C) | 2.4 × 109 | LFPa | (132) |
| 7.3 × 107 | PRc,d | (153) |
a
Laser flash photolysis, K4Fe(CN)6 as eaq– sensitizer, transient absorption monitoring of eaq.
b
Corrected to zero ionic strength.
c
Pulse-radiolysis generation of eaq–, transient absorption monitoring of eaq.
d
Measured at concentration greater than critical micellular concentration.