Table 2.
Summary statistics for PFAS concentrations (ng/mL) measured in this study.
| # C | n | % > LOD | GMa | GSDa | P25 | P50 | P75 | P95 | Max | |
|---|---|---|---|---|---|---|---|---|---|---|
| Perfluoroalkane sulfonic acids (PFSAs) | ||||||||||
| PFBS | 4 | 356 | 14 | -- | -- | <LOD | <LOD | <LOD | 0.12 | 0.59 |
| PFHxS | 6 | 453 | 97 | 0.99 | 1.93 | 0.73 | 1.10 | 1.52 | 2.32 | 4.80 |
| PFOS | 8 | 453 | 99 | 2.03 | 2.07 | 1.43 | 2.17 | 3.22 | 5.31 | 12.4 |
| Perfluoroalkane sulfonamides (FASAs) | ||||||||||
| PFOSA | 8 | 356 | 0 | -- | -- | <LOD | <LOD | <LOD | <LOD | <LOD |
| NMeFOSAA | 11 | 356 | 49 | -- | -- | <LOD | <LOD | 0.07 | 0.26 | 1.46 |
| NEtFOSAA | 12 | 356 | 5 | -- | -- | <LOD | <LOD | <LOD | 0.02 | 0.11 |
| Perfluoroalkyl carboxylic acids (PFCAs) | ||||||||||
| PFPeA | 5 | 356 | 48 | -- | -- | <LOD | <LOD | 0.11 | 0.22 | 0.66 |
| PFHxA | 6 | 356 | 3 | -- | -- | <LOD | <LOD | <LOD | <LOD | 0.26 |
| PFHpA | 7 | 356 | 14 | -- | -- | <LOD | <LOD | <LOD | 0.10 | 0.31 |
| PFOA | 8 | 453 | 97 | 0.63 | 2.35 | 0.45 | 0.71 | 1.07 | 1.69 | 4.42 |
| PFNA | 9 | 453 | 97 | 0.24 | 2.35 | 0.15 | 0.27 | 0.42 | 0.74 | 2.27 |
| PFDA | 10 | 356 | 48 | -- | -- | <LOD | <LOD | 0.13 | 0.27 | 1.06 |
| PFUnDA | 11 | 356 | 43 | -- | -- | <LOD | <LOD | 0.06 | 0.17 | 0.53 |
| PFDoA | 12 | 356 | 2 | -- | -- | <LOD | <LOD | <LOD | <LOD | 0.11 |
#C = number of carbon atoms; n = sample number; LOD = limit of detection; GM= geometric mean; GSD= geometric standard deviation; P25 = the 25th percentile.
a
Geometric means and standfard deviations were not calculated for congeners with detection frequencies < 50%; the values below LODs were replaced by LOD/√2.