Table 1.
The chemical structure of per- and polyfluoroalkyl substances (PFASs) most often used in the industry.
| Abbreviation | Number of Carbons in Fluorinated Chain |
Chemical Names | Chemical Formula | |
|---|---|---|---|---|
| PFASs | PFCAs | |||
| PFOA | 7 | perfluorooctanoic acid | C8HF15O2 | |
| PFHxA | 5 | perfluorohexanoic acid | C6HF11O2 | |
| PFNA | 8 | perfluorononanoic acid | C9HF17O2 | |
| PFDA | 9 | perfluorodecanoic acid | C10H19O2 | |
| PFSAs | ||||
| PFOS | 8 | perfluorooctane sulfonic acid | C8F17SO3K | |
| PFHxS | 6 | perfluorohexane sulfonic acid | C6F13SO3K | |
| PFBS | 4 | perfluorobutane sulfonic acid | C4F9SO3K | |
PFCAs, perfluoroalkyl carboxylic acids; PFSAs, perfluoroalkane sulfonic acids; PFOA, perfluorooctanoic acid; PFHxA, perfluorohexane acid; PFNA, perfluorononanoic acid; PFDA, perfluorodecanoic acid; PFOS, perfluorooctanesulfonic acid; PFHxS, perfluorohexane sulfonic acid; PFBS, perfluorobutane sulfonic acid.