Table 4.
Summed mass concentrations of fluoroethers (NVHOS, PFO3OA, PFO4DA, Nafion by-product 2) and legacy PFAS (PFOS, PFOA, PFHxS, PFNA, and PFHpA) in serum from 344 Wilmington, North Carolina, residents (289 adults and 55 children).
| Category | Concentration [ng/mL (percentage of total PFAS)]a | ||||
|---|---|---|---|---|---|
| 10th percentile | 25th percentile | Median | 75th percentile | 95th percentile | |
| fluoroethers | |||||
| Adults | 1.5 (14.0) | 3.2 (19.5) | 5.9 (21.6) | 10.9 (26.7) | 19.7 (32.6) |
| Children | 1.7 (18.9) | 2.8 (22.2) | 4.4 (25.9) | 7.4 (33.0) | 13.5 (38.5) |
| Overall | 1.5 (14.6) | 3.0 (19.6) | 5.7 (22.8) | 10.2 (26.4) | 19.0 (31.6) |
| legacy PFAS | |||||
| Adults | 8.0 (74.8) | 12.2 (74.4) | 20.8 (76.2) | 29.8 (72.9) | 47.8 (79.1) |
| Children | 6.8 (75.6) | 8.1 (64.3) | 11.3 (66.5) | 16.4 (73.2) | 24.0 (68.4) |
| Overall | 7.6 (73.8) | 11.1 (72.5) | 18.8 (75.2) | 28.7 (74.2) | 47.1 (78.2) |
| all PFAS | |||||
| Adults | 10.7 | 16.4 | 27.3 | 40.9 | 60.4 |
| Children | 9.0 | 12.6 | 17.0 | 22.4 | 35.1 |
| Overall | 10.3 | 15.3 | 25.0 | 38.7 | 60.2 |
Note: Nafion by-product 2, perfluoro-2-{[perfluoro-3-(perfluoroethoxy)-2-propanyl]oxy}ethanesulfonic acid; NVHOS, 1,1,2,2-tetrafluoro-2-(1,2,2,2-tetrafluoroethoxy)ethanesulfonic acid; PFAS, per- and polyfluoroalkyl substances; PFHpA, perfluoroheptanoic acid; PFHxS, perfluorohexane sulfonic acid; PFNA, perfluorononanoic acid; PFOA, perfluorooctanoic acid; PFOS, perfluorooctane sulfonic acid; PFO3OA, perfluoro-3,5,7,9-butaoxadecanoic acid; PFO4DA, perfluoro-3,5,7-trioxaoctanoic acid.
Percentage of total PFAS concentration (the sum of fluoroethers and legacy PFAS analyzed for in this study) is shown in parentheses.