Table 2.
LC/MS/MS parameters for all target analytes and internal standards.
| Compound | Abbreviation | Precursor ion | Product ion | ||
|---|---|---|---|---|---|
| (m/z) | (m/z) | Collision energy | Tube lens offset | ||
| Target analytes | |||||
| Perfluorobutanoic acid | PFBA | 212.9 | 168.9 | 11 | 80 |
| perfluoropentanoic acid | PFPeA | 262.9 | 69.0 | 39 | 85 |
| 218.9 | 11 | 85 | |||
| perfluorohexanoic acid | PFHxA | 312.9 | 119.1 | 22 | 86 |
| 268.9 | 11 | 86 | |||
| perfluoroheptanoic acid | PFHpA | 362.9 | 169.0 | 18 | 91 |
| 318.9 | 12 | 91 | |||
| perfluorooctanoic acid | PFOA | 412.9 | 169.0 | 19 | 96 |
| 368.9 | 13 | 96 | |||
| perfluorononanoic acid | PFNA | 462.9 | 218.9 | 18 | 104 |
| 418.9 | 13 | 104 | |||
| perfluorodecanoic acid | PFDA | 512.9 | 268.9 | 18 | 97 |
| 468.9 | 13 | 97 | |||
| perfluoroundecanoic acid | PFUnDA | 562.9 | 268.8 | 20 | 96 |
| 518.8 | 14 | 96 | |||
| perfluorododecanoic acid | PFDoDA | 612.9 | 318.8 | 20 | 107 |
| 568.9 | 14 | 107 | |||
| Perfluorobutane sulphonate | PFBS | 298.9 | 80.2 | 44 | 85 |
| 99.1 | 32 | 85 | |||
| Perfluorohexane sulphonate | PFHxS | 398.9 | 80.1 | 38 | 91 |
| 99.0 | 34 | 91 | |||
| Perfluorooctane sulphonate | PFOS | 498.9 | 80.3 | 45 | 104 |
| 99.1 | 45 | 104 | |||
| Internal standards | |||||
| Perfluoro-n-[13C4] butanoic acid | 13C4-PFBA | 216.9 | 171.9 | 11 | 80 |
| Perfluoro-n-[13C2] hexanoic acid | 13C2-PFHxA | 314.9 | 269.9 | 11 | 86 |
| Perfluoro-n-[13C4] octanoic acid | 13C4-PFOA | 416.9 | 371.9 | 13 | 96 |
| Perfluoro-n-[13C5] nonanoic acid | 13C5-PFNA | 467.9 | 422.9 | 13 | 104 |
| Perfluoro-n-[13C2] decanoic acid | 13C2-PFDA | 514.9 | 469.9 | 13 | 97 |
| Perfluoro-n-[13C2] undecanoic acid | 13C2-PFUnDA | 564.9 | 519.8 | 14 | 96 |
| Perfluoro-n-[13C2] dodecanoic acid | 13C2-PFDoDA | 614.9 | 569.9 | 14 | 107 |
| Perfluoro-n-hexane [18O2] sulphonate | 18O2-PFHxS | 402.9 | 103.0 | 34 | 91 |
| Perfluoro-n-octane [13C4] sulphonate | 13C4-PFOS | 502.9 | 99.1 | 45 | 104 |